Mac::
Maczealots Turtorials Archive, Omni Outliner, Omniweb, Backup Strategies for OS X, Tiny Apps for OS X, OS X Freeware.
Linux::
X 11, mach das Beste daraus, Why I won’t upgrade my Linux distribution, 10 things to do with a live Linux CD, Overclockix, Screenshots from that Distro.
2 Read::
W3C: Architecture of the World Wide Web, Volume One.