If you prefer to slide instead of swivel, then you'll be happy to hear that the T-Mobile Sidekick Slide is now available for purchase online and in select retail stores for $199.99 with a two-year contract. In addition to this announcement, T-Mobile also revealed that it will offer a consumer e-mail upgrade that brings push e-mail for AOL and Yahoo accounts, meaning you get real-time message delivery for those accounts. The carrier will roll out the upgrade as a over-the-air update for Sidekick Slide and Sidekick LX owners, with the hopes of reaching all customers by the end of November. Once you receive it, you'll just need your user login ID and password to get things rolling. As for the Slide, we're just finishing up our hands-on review of the device now so check back soon for the nitty-gritty.