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L0pht Heavy Industries
The L0pht is a collaborative group of whitehat hackers who publish full-disclosure advisories, usually including demonstration exploits.
http://www.l0pht.com/
MC2 Security Wire
Security information site that features a searchable exploit database that includes links to patch information.
http://securitywire.com/
USSR Labs
Security research team that publishes advisories and hosts a large updated exploit archive sorted by date.
http://www.ussrback.com/