Things that interest me...

Lots of these are in the various pages, but in case you need some additional references...

Gaming
xfire - finding games/friends/ingame voicechat
hamachi - sweet automatic vlan tool

Neurology
University of Iowa, Laboratory of Computational Neurology
Automated Image Registration (AIR)

RC Tanks
H*E*A*T - club
Armornuts - forum

Microcontrollers
Parallax - Basic Stamp
Microchip - PIC chips
Reynolds Electronics - Some very cool RF chips and PIC/Stamp applications
Custom PCB - design your own boards and get them made cost effectively
Eagle - circuit board design
PIC simulator - make sure your code works before you burn...
mikroelektronika - Slick compilers, nice boards and good info source

Useful Applications (don't set up a machine without them)
Nvu - used to create/edit these pages
Gimp - slick photoshop clone
Anapod - get rid of that useless iTunes app...
7-zip - the last compression tool you will need
G-spot - sort out all those codec problems
VNC - remote desktops for everyone

Free MS Compilers/tools
Cygwin - necessary to make Windows tolerable
SDK
Compilers

Make me laugh (not for the easily offended)
Flying Spaghetti Monster


More to come.