Google has released Chrome 4.0 to the beta channel of their popular web browser. Unfortunately, like before, the release is only for Windows. Both the Mac and Linux versions are highly anticipated, but have still not reached enough maturity to be exposed for real to the end users.

So what's truly new in this release, especially since it's only a short while since 3.0. The biggest improvement is the addition of bookmarks sync. This allows you to use your Google account (everyone has one, right?) to synchronize your bookmarks across Chrome's over the internet. In fact it seems to use Google Docs to store it. Previously such a feature would only be available in Opera through Opera Link (which is still multi-platform, including Opera Mini on mobiles).

For the time being Extensions support has been disabled until the final API arrives, hopefully this will be joined with a multi-platform release to make it all the more exciting.

If you're running Windows, be sure to give Google some feedback on your adventurous endeavor!