I'll have a lot of links.

http://www.hackers.com-All you need is right here!

http://www.silvatek.com/anarchywarez/main.html - Has mostly everything.

Cult of the Dead Cow [cDc]- Great site!

L0pht - A great site and group that seems to focus mostly on NT.
Packet Storm Security - Nice collection of almost every thing.
Root Shell - Nice collection of exploits, but usually out of date now.
Anti-Online - New and archive.
2600 - You should have heard of it by now.
DEFCON - The biggest hacker convention