@username + message – reply to another tweeter

D username +message – private (direct) message to tweeter

RT @username – retweet

GET username – grabs the last tweet of the tweeter (appears in a dropdown overlay)

WHOIS username – check out a tweeter’s information

FAV username – add last tweet from tweeter to your favorites

NUDGE username – reminds a tweeter to update by asking what they’re doing

STATS – returns your number of followers, how many your following, and bio info

INVITE phone number – sends an SMS invite to a mobile phone

From your phone…

ON – turns ALL phone notifications on

OFF – turns ALL phone notifications off

STOP, QUIT – stops all message to your phone immediately

ON username – turns on notifications for a specific tweeter on your phone.  NOTE: Using this from your phone only stops notifications to the place the command comes from; you’ll still collect the tweeter’’s updates on the web.

OFF username – turns off notifications for a specific tweeter on your phone. NOTE: Using this from your phone only stops notifications to the place the command comes from; you’ll still collect the tweeter’’s updates on the web.

FOLLOW username – follow a tweeter on your phone. Using follow/leave username from your phone is the same as using on/off username

LEAVE username – stop following a tweeter on your phone. Using follow/leave username from your phone is the same as using on/off username

Most of these commands you can find at the Twitter Support site, but I like to have my own handy list available.