If you're anything like me you just can't settle for out-of-the-box. I recently bought myself an iPhone while down at the Microsoft MIX conference in Vegas and have since been busy installing all sorts of apps and themes via installer.app. If you're already installing third-party apps on your own iPhone, you've probably seen the SummerBoard extension, which allows you to install custom themes for your phone. Well, we've created our own Habanero theme as well.
Just go into installer.app, find and install the SummerBoard app (if you haven't already). At that point go find the "Habanero" theme under the "Themes (Summeroard)" category. Just select it from the list, click "install" and you're done!