I just learned this a few weeks ago, and am really loving the fact that you can track the number of click-thru’s from the links that you post on Tweetdeck via bit.ly. All you need to do is to create an account on bit.ly, attach your twitter account to your bit.ly account, grab your bit.ly api code, input it into tweetdeck (settings, services) and begin posting links. Even if you have numerous accounts on tweetdeck, you can still track the links.
For those of you that have not tried this, please make sure that this is leveraged for your accounts. It is a great and simple way to track your links.