The Sidekick Download Catalog has a couple of new additions today for owners of the Sidekick 2008, Sidekick LX (including Tony Hawk Edition) and Sidekick Slide. Interestingly, the Facebook app is free while the Twitter app is $2 per month.

This comes as a catch-up to the Sidekick 2009, which comes pre-packaged with free Facebook and Twitter apps. Why the Twitter app needs a monthly fee is a mystery to me, but maybe it's really spectacular. [Thanks, Matt!]