Well, the folks developing TweetDeck aren't going to make it easy for Seesmic to catch up. Less than a day after Seesmic released its Preview software, TweetDeck got an update. The main focus of the update was to fix a memory leak that plagued TweetDeck (causing the application to consume more and more memory the longer it ran) but it included a few new features as well.
You can now opt to preview short URLs and TwitPics. This functionality is disabled by default, but once you turn it on, clicking a short URL will pop up a window with the title and full URL of the destination. A second click opens the link in your browser. This is an excellent security feature, even if it is a bit more cumbersome than just clicking off to an unknown destination. As Twitter becomes more popular and a juicier target for malware spammers, features like this need to become standard for Twitter clients.
The TwitPic preview works simliarly. A window pops up with a generous thumbnail of the actual image. This is more a time saver than a security feature. You can decide if the image is worth a second click and switching over to you browser to look at. Since a lot of Twitter picture posters tend to post images that are only relevant to friends 'in on the joke' this is a handy feature.
The last big addition is Facebook status integration. Next to the update box is a pair of checkboxes for Twitter and Facebook. You can send any update as a Tweet, as a Facebook Status update, or both.
TweetDeck is free, and of course so is the update. If you've tried TweetDeck in the past and found it to be too much of a resource hog, it might be time to try it again. If you just found it too complex, nothing in this update is going to make the product any more appealing.