I'm a fan of UberTwitter (UT), a small yet powerful Twitter client for
BlackBerry. To elevate the usage of UT, I frequently use shortcut keys
instead of the menu. Here are UT's shortcut keys:

U for update status / compose new tweet
R for reply to a status
J for reply all
L for ReTweet
D for direct message
G for go to user
S for search
O for refresh
V for favorite a status
Z for email a tweet