Here is a really great link to "The Ultimate Guide for Everything Twitter"
Thanks to the Web Designer Depot
Actions
f : favorite
r : reply
t : retweet
m : direct message
n : new Tweet
enter : toggle details pane
Navigation
? : this menu
j : next Tweet
k : previous Tweet
space : page down
/ : search
. : refresh Tweets and back to top
Timelines
g h : home
g r : replies / mentions
g p : profile
g f : favorites
g m : messages
g u : go to user
