I've found a lot of pages where are the keyboard shortcuts described.
Keyboard Shortcuts Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;301583
Keyboard Shortcuts Windows VISTA
http://windowshelp.microsoft.com/Windows/en-US/help/2503b91d-d780-4c80-8f08-2f48878dc5661033.mspx#EDC
Keyboard Shortcuts Office 2007
http://office.microsoft.com/training/training.aspx?AssetID=RC101562731033&ofcresset=1
Keyboard Shortcuts IE 7
http://windowshelp.microsoft.com/Windows/en-US/Help/fe192a3f-1401-4233-919e-cae97eca4c0c1033.mspx#EG