Argentine Tango Web sites for the San Francisco Bay Area and beyond:

• Tango No. 9 - tangonumber9.com
  With its unique instrumentation of violin, trombone, piano, and accordion, Tango No. 9 embraces both a reverence to tango's seductive past and a passionate, virtuosic vision of the music's storied future.
• Hombres de Tango - hombresdetango.com
  

• Bay Area Argentine Tango Association - batango.com
  The oldest and largest group to support Argentine Tango on the West Coast. Site includes class, milonga, event and artist listings.
• Little Switzerland - lilswiss.com
  Dancing, live music from tango to Zydeco, dining and historic bar.