If you have been eying the T-Mobile Sidekick 4G ever since its official announcement a few weeks ago, you have probably been anxiously awaiting some release date information. While T-Mobile has still yet to come forward with a release date, RadioShack has tweeted that the device will be releasing at The Shack on April 20, about 3 weeks from now. So, with a release date coming up its almost time to decide if this will be your next device. Be sure to hop in the Sidekick 4G forums and chat it up! [@RadioShack]