Windows only: Fishbowl, the Facebook client demoed at Microsoft's introduction to Silverlight 4, is now available for download — and it adds quite a few new desktop features to the Facebook experience, including badges, a mini news feed, and more.

At first glance, Fishbowl looks a lot like a reorganised, slightly better looking version of Facebook. Along the top you have the usual sections of Facebook — Home, Profile, Photos, etc — and on the left sidebar you have options for the window you're in. Navigating these sections is just like Facebook's website, so it's pretty intuitive.

However, as a desktop client, it adds a few new features that really enhance Facebook's usability. It turns the photos section of Facebook into an almost iPhoto or Picasa-like interface — you can scroll through albums and view pictures as usual, but once in single-photo view you can zoom, view as a slideshow, save the picture or even print them directly from Fishbowl.