Yes it slows down Google Desktop search....
But doesn't it slow down everything?
The US Justice Department has urged state authorities to reject Google's anti-trust claim against Microsoft. Google complained to regulators that Microsoft's Vista operating system discouraged use of Google search. Thomas O Barnett, assistant attorney general, sent a memo to state attorney generals encouraging them to drop …
... since January 2007, and I've only a coupel of times used any SE other than Google.
As for slowing Google Desktop Search down - Vista changed a lot of things, lots of apps don't quite work how they did previously, until the developers catch up and patch them/work out what's going on.
... like I'm bothered with Google desktop search when I have Vista, it looks so pretty :)
"But doesn't it slow down everything?", funnily enough no it doesn't, I was expecting it to but installing Vista has meant my Laptop has started performing a lot better than when I had XP Media Centre (or XP 98 2nd Edition as I liked to call it).