If you haven’t used the new launcher Sony Ericsson’s using for the latest in their Xperia line, then you haven’t lived. (OK, it isn’t that cool.) Anyway, the launcher that they’ll be using for phones such as the Xperia Arc and the Xperia Play is now available for download. You don’t even need to be rooted! All it requires is the installation of a simple .APK file and you’ll be on your way. Go ahead and grab it from here, courtesy of XDA.
[Update]: The above link is for devices with 854×480 resolution, such as Motorola’s family of devices. If you’re rocking 800×480 (most high-end HTC and Samsung devices), you’ll need to grab a specific version for that from here.