That Android 3.1 update that Google announced during I/O is slowly rolling out to 3G Xoom owners as we speak. How'd we know such a thing? Why, it just landed on our in-house Xoom, of course! Most of the changes to Honeycomb are happening under the hood -- better HTML5 support, faster performance, and USB host functionality for connecting peripherals like game controllers and mice -- but there are some improvements that will be a lot more obvious to the user. Perhaps our favorite is the addition of resizable widgets. For the moment only the email and Gmail inbox, calendar and bookmarks widgets can be stretched or s