Google Desktop 2.0
I found a feature I really like in Google Desktop 2.0.
I'm buying a new house, and I've been working on a list of features I want to upgrade. I thought I'd received pricing on a particular feature, but I couldn't find it, so I searched my desktop for it using GDS 2.0.
It showed me that the text I was looking for was contained in an earlier version of the document I was working on. It was actually keeping old versions of the document, and was able to give me the text from the earlier version.
Very cool feature.