There is surely plenty missing here. I tried to focus on higher level sites--that is, sites that will lead you to others, rather than trying to cover everything. That said, please feel free to make suggestions in the comments (and let me know if any links are broken or pages have moved). I'll try to keep this periodically updated.
Also, a lot of these places/organizations are on Facebook, so if you prefer to get your info in your News Feed rather than your inbox, look 'em up there.
E-mail lists—if yinz want to be in tha know, n’at.
- Carnegie Library of Pittsburgh (CLP) First Floor New & Featured
- Living Pittsburgh (Free & affordable stuff in the 'burgh; sign up box for email list on lower right)
- Pennsylvania Humanities Council
- Phipps Conservatory (Phipps Tree-free news)
- Pittsburgh Arts & Lectures (Click on “Be the first to know” button to sign up)
- Pittsburgh Filmmakers (Independent movie theaters)
- Pittsburgh Downtown Partnership Get Into It! weekly newsletter
- PITTSBURGH Magazine (Weekly newsletters on different topics.)
- Pittsburgh Parks Conservancy
- Slow Food Pittsburgh
- Groupon Pittsburgh
- LivingSocial Pittsburgh
- Daily Deals from the Pittsburgh Post-Gazette
- Google Offers Pittsburgh
City of Pittsburgh
- Official website: www.pittsburghpa.gov
- Public Safety Page: http://www.pittsburghpa.gov/publicsafety/
- Sign up for Public Safety and Emergency Alerts
- Also see: http://communitysafety.pittsburghpa.gov/
- City Council
- Mayor’s 311 Line (to report issues, ask questions, etc)
- From cellphones, you must dial: (412) 255-2621
- A MAP YOU WILL NEED (Note: You can print out a .pdf of the entire map, or any subsection by clicking on the .pdf icon in the upper right corner on whatever page you'd like to print)
- MORE Maps! (Seriously, these are pretty cool! Locally made guides to stuff you want to know how to do in our belovedly idiosyncratic city...
- Cool Pittsburgh - The University of Pittsburgh's guide to living in the city
- Living Pittsburgh (Free & affordable stuff in the 'burgh)
- Pittsburgh City Living
- Port Authority of Allegheny County (bus, subway, inclines)
- PLANPGH – The Planning Department’s site for the first-ever comprehensive plan for the City. Lots of opportunity for community involvement.
- A Newcomer's Guide to Pittsburgh (Carnegie Library of Pittsburgh)
- Rivers of Steel National Heritage Area (Rivers of Steel National Heritage Area's mission includes: historic preservation, cultural conservation, education, recreation and resource development.)
- Visit Pittsburgh
- Check out their Visitor's Guide.
- VisitPA
- East Liberty
- Pittsburgh Downtown Partnership
- Greater Park Place Neighborhood Association
- Homewood Nation
- Lawrenceville
- Only in Oakland
- Polish Hill Civic Asssociation
- Regent Square Civic Association
- Squirrel Hill Urban Coalition
- The Strip District
Outdoors
- Audubon Society of Western PA
- Citiparks
- Nine Mile Run Watershed Association
- PA DCNR (Dept. of Conservation & Natural Resources)
- Pittsburgh Parks Conservancy
- Riverlife Pittsburgh
- Three Rivers Birding Club
- Venture Outdoors
- Walls Are Bad
- Western PA Mushroom Club
- Wissahickon Nature Club
Arts
- August Wilson Center for African American Culture
- Calliope: The Pittsburgh Folk Music Society
- Carnegie Library of Pittsburgh
- Carnegie Mellon University Drama
- City Theater
- Handmade Arcade
- I Made It! Market
- MCG Jazz
- Miller Gallery at Carnegie Mellon University
- Penn Avenue Arts Initiative
- Pennsylvania Humanities Council
- Pittsburgh Arts & Lectures (Drue Heinz Lecture Series; American Shorts; Black, White & Read All Over family series
- Pittsburgh Chamber Music Society
- Pittsburgh Contemporary Writers Series
- Pittsburgh Cultural Trust
- Pittsburgh Filmmakers
- Pittsburgh Irish & Classical Theater
- Pittsburgh Jazz Society
- Pittsburgh Public Theater
- Pittsburgh Symphony
- Quantum Theatre
- Renaissance & Baroque Society
- Silver Eye Center for Photography
- Staycee Pearl Dance Project
- Texture Contemporary Ballet
- Three Rivers Arts Festival
- Ticket Web
- University of Pittsburgh Department of Music
- WYEP Concert Calendar (See also the Bluegrass calendar)
News & Public Media
- City Paper
- Pittsburgh Post-Gazette
- POP City
- The Allegheny Front
- Patch.com -- Find the Patch closest to you for hyper-local news.
- Pgh's East End: http://foresthills-regentsquare.patch.com/
- New Pittsburgh Courier
- Pittsburgh Tribune-Review
- Pittsburgh Quarterly
- KDKA
- WPXI
- WQED PBS TV/89.3FM-classical radio/NPR headlines/PITTSBURGH Magazine
- WYEP 91.3FM “Indie” music/NPR headlines; World Cafe w/David Dye; Thistle & Shamrock
- Essential Public Media 90.5 FM (NPR & other news)
Attractions
- Carnegie Library Main - Best. Library. Ever.
- Carnegie Museums of Natural History & Art, The Andy Warhol Museum, & the Science Center
- East Liberty Presbyterian Church
- The Frick Art & Historical Center (Clayton)
- Maxo Vanka Murals, St. Nicholas Croatian Catholic Parish (Millvale)
- The National Aviary
- Phipps Conservatory
- Pittsburgh Zoo & Aquarium
- St. Paul's Cathedral (Oakland)
- Schenley Plaza
- Senator John Heinz History Center
- University of Pittsburgh Oakland campus
- Cathedral of Learning
- University of Pittsburgh Nationality Rooms (Floors 1 -3, Cathedral of Learning)
- Honors College (36th Fl., Cathedral of Learning)
- Heinz Chapel (which has some of the most amazing stained glass windows in the world, notable not only for their beauty, but for the breadth of characters and the fact that women and men are equally represented)
- Frick Fine Arts Building
- William Pitt Union
- Felix De La Concha's 365 Views of the Cathedral exhibit in Alumni Hall
Blogs & Other Sundry Sites
- Angry Drunk Bureaucrat (ADB)
- BikePGH
- Boring Pittsburgh
- Design Allies | Design Center Pittsburgh
- Homewood Nation
- IheartPGH
- Pittsburghese
- Tree Pittsburgh
- Pittsburgh History & Landmarks Foundation
- Rick Sebak (Pittsburghers love him more than Kennywood.)
- That’s Church (Virginia Montanez aka PittGirl’s blog)
- The Sprout Fund
- Three Rivers Bioneers
Noms
- City Sponsored Farmer’s Markets
- eatPGH Blog
- Edible Allegheny
- FoodBurgh
- Local Harvest (Farmer’s Markets, CSAs, etc)
- Pennsylvania Association for Sustainable Agriculture
- Slow Food Pittsburgh
- The Strip District
- Table Magazine
- Big Burrito Restaurant Group
- City Paper Dining Guide
- Chef Kevin Sousa
- PITTSBURGH Magazine Dining Guide
- Urbanspoon Pittsburgh
- Yelp Pittsburgh
- Bangkok Balcony (Squirrel Hill)
- Coca Cafe (Lawrenceville)
- Coriander (Squirrel Hill)
- Franktuary (Lawrenceville)
- Green Mango Noode Hut (Monroeville)
- legume (Oakland)
- Pusadee's Garden (Thai; Lawrenceville)
- ROOT 174 (Regent Sq)
- Salt of the Earth (Garfield)
- Smiling Banana Leaf (Thai, Highland Park)
- Spice Island Tea House (Oakland)
- Thai Cottage (Regent Square)
- Tin Front Cafe (Homestead)
- Tram’s Kitchen (Vietnamese; Bloomfield/Lawrenceville)
- Udipi Café (S. Indian, Monroeville)
- Aldi (East Liberty; South Side; Forest Hills; Penn Hills)
- East End Food Coop (N. Point Breeze)
- Trader Joe's (6343 Penn Ave., East Liberty)
- The Strip District
- Klavon's Ice Cream Parlor (2801 Penn Avenue)
- Lotus Food Market (1649 Penn Avenue)
- Reyna Foods (2023 Penn Ave)
- Pennsylvania Macaroni Company (2010-2012 Penn Avenue)
- Pittsburgh Public Market (Produce Terminal Bldg., Smallman St., Entrance opp.17th St.)
- S&D Polish Deli (2204 Penn Avenue)
- Robert Wholey & Co. Inc. (Fish market; 1501 Penn Avenue)