T-Mobile has announced the next evolutions of the T-Mobile Sidekick family. Two newly designed devices–T-Mobile Sidekick LX and T-Mobile Sidekick Slide–will hit the streets this fall and both feature the must-have assetse, including the newly launched, custom-designed MySpace application.

While Sidekick enthusiasts await the new devices, T-Mobile kicks off Sidekick Nation, a user-generated video contest hosted by MySpace where fans have the chance to show their creativity and win a grand prize that includes $10,000 and a trip to Hollywood to see his/her video highlights aired on Jimmy Kimmel Live.