Keyboard shortcuts You Must know

Email Services:
Gmail: http://mail.google.com/support/bin/answer.py?ctx=gmail&hl=en&answer=6594
Hotmail: http://windowslivehelp.com/solutions/settings/archive/2009/08/31/Hotmail-Keyboard-shortcuts.aspx

Operating Systems Shortcuts:
Windows: http://support.microsoft.com/kb/126449
Ubuntu: https://help.ubuntu.com/community/KeyboardShortcuts

Application Softwares:
Microsoft Word: http://support.microsoft.com/kb/290938
Adobe Photoshop CS4:
http://morris-photographics.com/photoshop/shortcuts/downloads/PSCS4_Keyboard_Shortcuts_PC.pdf
All Adobe Photoshops: http://morris-photographics.com/photoshop/shortcuts/
Peach Tree: http://eu.dummies.com/WileyCDA/how-to/content/peachtree-keyboard-shortcuts.navId-323176.html
Web browsers:
Google Chrome Web browser: http://www.google.com/support/chrome/bin/answer.py?hl=en&answer=95743
Internet Explorer: http://support.microsoft.com/kb/306832
Firefox Web browser: http://support.mozilla.com/en-US/kb/Keyboard+shortcuts
Opera Web browser: http://www.opera.com/browser/tutorials/nomouse/
Safari Web browser: http://www.dori.com/safariShortcuts.html
Google Sketcup: http://groups.google.com/group/Sketchup-Pro/attach/bd7d155ad6c90c89/Quick+Reference+Card+2.pdf?part=2&view=1
AutoCad: http://docs.autodesk.com/ACD/2010/ENU/AutoCAD%202010%20User%20Documentation/index.html?url=WS1a9193826455f5ff-4f6d1f1d11d24be3e03-7651.htm,topicNumber=d0e386269

Email Clients:
Microsoft Outlook:http://office.microsoft.com/en-us/assistance/HP030842231033.aspx