As the new season begins there were obviously some teething problems. Some data was different and the authorization url had changed. I've repackaged a new release, but I suspect there'll be a few more tweaks needed during the next few events.
On a development front, I'm going to try and finish porting the library to the .Net compact framework.
If you're actively interested in using the library, I would highly recommend getting the latest source code instead of the releases. Especially during the first few races while I fix any new 'features' that have been added to the stream (you can get notification of changes by subscribing to the Google source change feed: https://code.google.com/p/f1livetiming/feeds).