Some links, in no particular order, which I find interesting:

• Skype
• RWTH Aachen University
• AllemaniACs RoboCup team at RWTH Aachen University
• Knowledge-based Systems Group at RWTH Aachen University
• Institue for Biology II at RWTH Aachen University
• RoboCup
• McGill Choral Society
• Akademischer Verein d'Letzebuerger (Luxembourgish students in Aachen)
• Ken Rockwell
• Piled Higher and Deeper
• xkcd
• gPhoto digital camera software
• Hugin panorama photo stitcher
• Luminance HDR HDR imaging software
• UFRaw
• GIMP (GNU Image ManipulationProgram)
• VLC media player
• The Register
• Slashdot
• Wired
• heise online (german; publisher of c't magazine)
• Flowplayer, open source video player for the web