I've broken the sites into various categories, depending on the content available at the site.

Recommendations       History/Overviews       General Coverage       Other Dialects

Tutorials Online Magazines Vendors/Tools       Blogs

Games GW-BASIC       Forums       Other

Games
These sites provide some tutorials on writing games, but more often simply provide source code or executables for games written in QBasic (or QuickBasic).

• Fomalhaut Software
  
• Qbasic Gamerz Society
  
• VPLanet - QuickBasic Game Review Magazine
• Acid Works Software
• DoorKnob
• Laz's Big Fat QBASIC Page
• Outer Court Basic - QB Files
• Piptol Productions
  
• QBASIC Archives
• Classic BASIC Games Page
• GBGames
• KABOOM 3D-Engine
• QBasic Games and Tools
  

There's also a GW-BASIC Games site that might be of use to QBasic programmers.

I welcome suggestions for additions to this list.