Google Desktop can finally automatically remove deleted files from the index. You can add modules from Personalized Homepage to the desktop.
Plugins are now called gadgets and have a new development model - they are interactive XML mini-applications. Google Desktop will recommend new gadgets and can also automatically create a personalized Google homepage.
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Unfortunately, the RAM usage will be high if you choose too many gadgets.
* In case you were wondering about the Google Media Player, it's just a small skin for Windows Media Player integrated with Google Desktop. Try this: play a song with Google Media Player and then open Windows Media Player. You'll see the same song playing.