Google Desktop for windows comes up with all the features like search, sidebar and GADGETS. Well now bingo for linux users,,, you can download the google gadgets for linux and run your favourite application right from ur desktop on ur loving linux platform.
The source code can be downloaded from here. A careful compilation is required with loads of pre-requirements. If you are not interested in source code you can directly install the prebuilt binary package.
Well whatever you do Please read QuickStart and HowToBuild carefully before building and using Google Gadgets for Linux. Or u might end up messing up.
Spice up and have fun.