Security/hacker/site defacement news. Part of the growing field of "gray sites",
offering security news and info to both the white hats (sys admins, security
professionals) and the black hats (crackers).
The Hacker News Network, providing news and opinions for the hacker community.
Another gray site.
Known exploits for online programs including UNIX etc. Searchable and continuously
updated, useful for sysops (and hackers) to keep up-to-date on where their systems