Lifehack.org writer, Leo Babauta, has compiled a nice selection of keyboard shortcuts for a variety of apps at DumbLittleMan.
He goes from Firefox, Gmail and Google Reader to Windows, Mac OS and Microsoft Office software.
Quick FTP. For quick and dirty FTP, Cmd-K will open the Connect to Server command.
Productivity Ninja: 101 Ways to Rock the Keyboard – [DumbLittleMan]