What is tweetdeck exactly?

[littleeye091]

And how would it benefit me to use it?

[Sweetdaddy Rex]

I think it has something to do with homosexuality. Rex ( 72 ).

[Brendan Long]

Tweetdeck is a Twitter desktop application developed on the Adobe Air interface.
Its primary advantage is the notifications you receive when your followers tweet AT you, and when the people you follow tweet. You can also make a tweet straight from your desktop, and Tweetdeck allows for multiple Twitter accounts to be used at once.
Tweetdeck is also an application for iOS.

http://i53.tinypic.com/aop5jq.jpg (example image)

Tweetdeck also comes with multiple tabs, so that you can sort your Outgoing, received, DM's, and many other nice features.