VDR on facebook
Digital Television (DVB) on Linux (Linux DVB drivers)
VDR mailing list (you really should subscribe to this!)
LIRC (Linux Infrared Remote Control)
Channel listings for VDR (by DXAndy)
www.vdr-portal.de (by Gerald Berwolf))
bleb.org (TV listings for British channels)
Howto: Upgrade a full-featured card to 4 MByte SDRAM (by Oliver Endriss)
Howto: Full Transport Stream from Full-Featured DVB Cards (by Oliver Endriss)
WOLFSOFT GmbH (this company offers a service to upgrade TT DVB cards to 4MB SDRAM for 256 color OSD)
vdrfrance.free.fr (a French VDR site)
NVRAM WakeUp (a tool to automatically wake up your PC for recording)
VDRAdmin-AM (by Andreas Mair)

VDR Distributions (complete Linux distributions optimized for VDR)

LinVDR (a Linux distribution for the Video Disk Recorder)

Wikis

English VDR Wiki
German VDR Wiki

My other projects

Full Motion Flight Simulator
GeoTagger - Display and modify GPS location data in photos
Interface zur Verbindung einer digitalSTROM-Klemme GR-KL200 mit einem VELUX KLF 050x