Got from my old Bookmarks ,below are some useful Cheat Sheets ,let me know if u found any other cheat sheets i will update the post

Nmap
http://sbdtools.googlecode.com/files/Nmap5%20cheatsheet%20eng%20v1.pdf

Nessus
http://www.secguru.com/link/nessus_nmap_scanning_cheatsheet
Backtrack 4
http://www.corelan.be:8800/index.php/2009/07/04/backtrack-4-cheat-sheet/
misc tools
http://www.sans.org/resources/sec560/misc_tools_sheet_v1.pdf
Metasploit Meterpreter
http://en.wikibooks.org/wiki/Metasploit/MeterpreterClient
http://www.rmccurdy.com/scripts/Metasploit%20meterpreter%20cheat%20sheet%20reference.html


Oracle Security
http://www.red-database-security.com/wp/oracle_cheat.pdf
XSS
http://ha.ckers.org/xss.html
http://openmya.hacker.jp/hasegawa/security/utf7cs.html
http://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet

SQl Injection
http://ha.ckers.org/sqlinjection/
http://ferruh.mavituna.com/sql-injection-cheatsheet-oku/
http://ferruh.mavituna.com/oracle-sql-injection-cheat-sheet-oku/
http://www.irongeek.com/xss-sql-injection-fuzzing-barcode-generator.php

Microsoft SQL,Sybase,MySQL,Oracle,PostgreSQL,DB2,IngresBypass SQL Injection Filters
http://michaeldaw.org/sql-injection-cheat-sheet
http://pentestmonkey.net/cheat-sheets/
Packetlife Cheatsheets

http://packetlife.net/cheatsheets/

Ed Skoudis’ Pentest Cheatsheets

Windows commandline tools
http://www.sans.org/resources/sec560/windows_command_line_sheet_v1.pdf
Netcat Cheat Sheet
http://www.sans.org/resources/sec560/netcat_cheat_sheet_v1.pdf
Useful Attack Tools, Metasploit commands, HPing, FGDump
http://www.sans.org/resources/sec560/misc_tools_sheet_v1.pdf

Reverse Engineering Malware Cheat Sheet

http://zeltser.com/reverse-malware/reverse-malware-cheat-sheet.html

Security Archiecture Cheat Sheet for Internet Applications

http://zeltser.com/security-management/security-architecture-cheat-sheet.html

CEH cheatsheets from Mindcert

http://www.mindcert.com/resources/MindCert_Nmap_MindMap.pdf

http://www.mindcert.com/resources/MindCert_CEH_Enumeration_MindMap.pdf

http://www.mindcert.com/resources/MindCert_CEH_Ethical_Hacking_MindMap.pdf

http://www.mindcert.com/resources/MindCert_CEH_Footprinting_MindMap.pdf

http://www.mindcert.com/resources/MindCert_CEH_Scanning_MindMap.pdf

http://www.mindcert.com/resources/MindCert_CEH_System_Hacking_MindMap.pdf

http://www.mindcert.com/resources/MindCert_CEH_Trojans_MindMap.pdf

http://www.mindcert.com/resources/CCNA_Cisco_IP_Routing.pdf