BLOGS:
Krebs
Schneier
DarkNet
SecuriTeam
SECURITY:
ISSA
OWASP
SANS/CAG
DarkReading
NETWORK:
DNSstuff
Net-Tools
Protocols
Internet Pulse
Akamai
MALWARE:
Immunet
VirusTotal
CSIRT
SecureList
SenderBase
VirusRadar
TOOLS:
Snort.org
WebSniff
OpenDNS
Project Honeypot
SpamCop