For many people, the only reason worth upgrading to Vista if for the look since the functionality and basic framework really don't differ that much from XP.

If you think the same way, then you'll be more than happy with Vista Transformation Pack. Once installed, the program makes superficial changes to XP that give it the Vista look. The main changes are that it "Vistarises" your start-up screen, cursors, sounds, screen-savers, tool bars, clock, etc. The transparent effect in Vista is hard to emulate on XP machines but by combining with Windows Blinds, Vista Transofrmation Pack does a surprisingly impressive job. Be warned however that some users have complained the program changes driver DLLs in XP which make it difficult to remove, or at least, it leaves problems behind when you do so.

To be fair to them, the developers advise you to view their user discussion board before installing to be warned of any potential problems as they readily admit that they are not aware of all the bugs it may cause. Note that if you're simply updating Vista Transformation Pack, there's no need to uninstall the original - just install the patch. They've also added a user selection feature whereby if you log onto your PC as a different user, you can select whether you want to transform your XP desktop to Vista.

This is probably one of the best transformation packs out there although be warned that it's likely that you'll suffer conflicts with programs from time to time, and may have problems with XP when it's uninstalled.