Badass mind map for passive open source intelligence gathering.
ExploitDB, Offensive Security's Exploit Database Archive is an amazing resource.
Be it for google dorks, exploits, shellcode, or technical papers.
Want to be able to search for exploits offline, or via terminal?
Check out the following, a few simple commands will arm you with the entire DB!
Old school e-zine with a ton of interesting articles.
You wont find any color pictures there if that's your thing.