We have also increased the session timeouts for desktop and web applications to 24 hours. To extend the session beyond 24 hours, a web app can transparently link the user to the login page which will automatically redirect back to your application with a new session key. Desktop applications can extend their session as usual by simply making API requests.
Finally, we thought you guys might be interested in a new Facebook Toolbar built for Firefox. It’s open source, so if you’re interested in adding functionality (or porting it to another browser), join the discussion thread!