This past week, Google announced the release of Google Web Toolkit 1.5 Release Candidate 1.Downloadable now, the latest GWT release incorporates a host of improved as well as new features.
Creation of more compact code, multiple-browser support, Java 1.5 support, full-feature debugging , lots of online support, and more.
You can download the RC (or read more about it) at the Google Code website here.