View Shortcuts
Taken from the client help file on 2008-06-24
Keyboard shortcuts Note: Windows users should use CTRL instead of CMD
keystroke = command
CMD+B = Markdown: bold
CMD+I = Markdown: italic
CMD+U = Markdown: link»
CMD+R = Markdown: code
CMD+F = toggle between showing all tweets and only replies & direct messages
CMD+SHIFT+M = Mark all messages as read in current view
↑ or J or CMD+J = select next message
↓ or K or CMD+K = select previous message
CMD+↓ = select next dm
CMD+↑ = select previous dm
CMD+SHIFT+↓ = select next reply
CMD+SHIFT+↑ = select previous reply
CMD+END = select last message
CMD+HOME = select first message
F5 = reload current view
SHIFT+F5 = clear and reload current view
CMD+SHIFT+A = open shorten link window
CMD+T = jump to message entry box
CMD+SHIFT+2 = respond to sender of currently selected message
CMD+, = View Preferences
CMD+{1-6} = Switch to tab 1-6