Vista or XP?

I started yesterday thinking more and more that many Vista features, apart from Aero, were already available in XP, and wanted to describe them here in a new post: a feature like the indexing system was already available through Windows Desktop Search from Microsoft itself, or through Google Desktop with sidebar etc...

This article from Paul Thurott will give you all the guide lines.

don't forget, if actually many features can be installed through the use of third party software, they'll never match the quality of integration that they have in Vista. So don't expect to transform XP into Vista for free! Vista is a new OS, definitely. And Stardock might give you soon or later an aero for XP, because Stardock products are good, I've used them and liked them, but Vista is much more than Aero, and Windows Desktop Search for XP might be fast, but matches in no way the Vista interface, even if it uses the same technology.