Google has released the GWT 2.1.1. For Eclipse users, simply click on the "Google updates available" icon in the lower left hand corner of your screen, or select the "Help->Check for Updates" menu item.
Alongside this release, also updated the Google Plugin for Eclipse and GWT Designer. Both can be installed via the links below:
The specifics of this release are detailed below, but if you're interested in getting started you can do so here.