Almost on schedule, Acer has started pushing out an update for its Iconia Tab A500 that will upgrade the 10-inch slate to Android 3.1. If you'll recall, the update actually leaked late last month, but would have required folks to take the risk of flashing their tablets. As is often the case, it's unclear how long the roll-out will last, so don't be crestfallen if you can't enjoy those resizeable widgets just yet. For those of you who did wake up to an u
