NuMega - Producers of SoftIce & WinIce.
Get WinDbg Here.
CodeGuru - Self Explanatory I guess ;)
sysinternals.com - Mark Russinovich & Bryce Cogwell. Windows internals. Top level tools and utils.
John Robbins, the God of debugging.

ZDNET - http://www.zdnet.com - Nice place if you are gonna buy something or get some info.
Pricewatch - Pricewatch.com - Get the best prices on hardware here.

    Other's will be added later, lazy to do that rigth now, sorry :)