Friend Teams:
Wolfpack2501.com
Team Handicap
Digital Calamity
UGMPT and UGM
Team Blank

Mac Underground Related:
Glock9
2600 Magazine
Logik
Freaky's Mac Archive
HackerStickers.com
MSec.net
Astalavista
Team2600 Mirror
The Dive
Shared Forums
Nessno's Network

Hacking/Info Resources:
OS X Link Resources
Stay Invisible (Proxies)
ISS.net Exploit info
RootWars.org

Security Resources:
ISS.net
cert.org
Info Security News
Secure Mac

TopSites:
Freaky's Topsites
UndergroundMac Topsites