Useful cheat sheets

Here is a collection of cheat sheets. I find them extremely useful

Windows command line cheat sheet http://www.sans.org/resources/sec560windows_command_line_sheet_v1.pdf

TCP/IP Cheat Sheet http://www.sans.org/resources/tcpip.pdf?ref=3871

Tcpdump cheat sheet http://planetozh.com/download/refcards/tcpdump.pdf

Linux Security Quick Reference http://www.tldp.org/REF/ls_quickref/QuickRefCard.pdf

Oracle Security Cheat Sheet http://www.red-database-security.com/wp/oracle_cheat.pdf

Nmap & Nessus Cheat Sheet http://www.secguru.com/files/cheatsheet/nessusNMAPcheatSheet.pdf

Google Hacking and Defense Cheat Sheet http://www.sans.org/mentor/GoogleCheatSheet.pdf

SQL Injection Cheat Sheet http://ha.ckers.org/sqlinjection/

Cross Site Scripting Cheat Sheet http://ha.ckers.org/xss.html

Web application Cheat Sheet http://www.secguru.com/files/cheatsheet/webappcheatsheet2.pdf

XSS Cheat Sheet http://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet

Intrusion Discovery Cheat Sheet Windows http://www.sans.org/resources/winsacheatsheet.pdf

Intrusion Discovery Cheat Sheet Linux http://www.sans.org/resources/winsacheatsheet.pdf

Windows looking for compromise http://www.ucl.ac.uk/cert/win_intrusion.pdf

Checking Unix / Linux for compromise http://www.ucl.ac.uk/cert/nix_intrusion.pdf

DDoS incident response cheat sheet http://www.zeltser.com/network-os-security/ddos-incident-cheat-sheet.pdf

Security incident survey http://www.zeltser.com/network-os-security/security-incident-survey-cheat-sheet.pdf

Memory analysis cheat sheet http://computer.forensikblog.de/files/cheatsheet/Memory%20Analysis%20Cheat%20Sheet.current.pdf

Forensic analysis cheat sheet http://forensics.sans.org/community/downloads/retrieve.php?file=handout.pdf