Google Desktop has a new version (4.5) that supports Microsoft Office 2007, Windows Vista and Firefox 2.0.
It has this the new sidebar, that has transparent areas, new icons, easier to use options.
As the Sidebar is transparent, it fits seamlessly with your desktop environment. Gadgets that fought for users attention now look right at home. This simple sidebar provides a better place to find your email, news, feeds, stock prices, weather and other essential information in one go.
Another change is that Google Desktop sends you to the cached version if you click on a search result that has been deleted or moved, so you no longer get an error message, but search the web history.