Discussion forums:

English (USA)
  Ross-Tech's own Forum
VWvortex VCDS Diagnostics Forum
AudiWorld VCDS / Audi Computer Diagnostics Forum
TDIClub OBD Scanners Forum
MyTurboDiesel.com VCDS Forum
Bentley Publishers VW OBD-II Forum
Bentley Publishers Audi OBD-II Forum

English (Other than US)
UK-MKIVs VCDS User Information Forum
BriSkoda.net Diagnostics & VCDS Forum
Audi-Sport.net VCDS Forum
VAGdrivers.net VCDS & Diagnostics, Electronic, Electrical Forum
VW Audi Forum VCDS Information

German:
PCI Diagnosetechnik VCDS Forum
Auto-Intern VCDS Forum
MFT Diagnosetool VCDS Forum
Dieselschrauber.de Diagnose Forum

Announcements:
VCDS-Announce E-Mail List:
All VCDS users are strongly encouraged 
to join this mailing list.   Subscribing to this
List is the only way to be notified of software
updates.  You will not receive a deluge 
of unwanted mail from this list.

Click Here to Read the most recent Announcements