We have seen many desktop clients for Twitter, Facebook and other social sites like Tweetdeck, Seesmic etc. Sobees is a nice desktop app for Twitter, Facebook, LinkedIn and MySpace. Sobees provides you with a nice interface and also comes with many features to make it a good desktop tool for social networks. It provides full support for Twitter, Facebook and MySpace networks right on your desktop.
Sobees supports themes and layouts, so you can customize the way your want the multiple networks to be displayed on your desktop. There are various layout to choose from. When you update the status, it open a new pop up window where you can select the networks you want to update.
Another feature of Sobees is that it supports RSS feeds, you can add and read RSS feeds using this tool.
Sobees is based on .NET and is easily installable on any Windows 7 computer as well as Vista and XP.