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Vista Transformation Pack 7.0
Link: http://www.windowsxlive.net/?page_id=15

Pros:
- Compared to other Vista themes for XP, this one reproduces the Vista look most accurately.
- Option to choose to install several third-party programs that reproduce the functionality/appearance of Vista, such as the sidebar, orb, etc.
- Supports full transparency (via WindowsBlinds).
Cons:
- VTP 7.0 makes changes to a lot of system files. This may have the potential to mess up your Windows installation permanently if something goes wrong during the VTP 7.0 installation process.
- Can be resource heavy, as some of the third-party programs included in VTP 7.0 use a bit of memory.
- Uninstalling VTP 7.0 sometimes doesn't quite remove everything.
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Vista Inspirat 2
Link: http://www.vista-inspirat.net/

Pros:
- Does not make many changes to system files.
- Quick installation process.
- Easy to use control panel to repair icons/boot screens whenever Microsoft releases new updates that have the side-effect of reverting Windows back to the original XP icons and boot screens.
- Not memory/resource intensive.
Cons:
- Close, but not as accurate to the real Vista, compared to VTP 7.0.
- Does not include extra programs that emulate the sidebar and other Vista-like functionality.
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Besides these two, there are also lots of Vista-like visual styles available over at deviantART. You can find them at this link: http://search.deviantart.com/?q=Vista+in:customization/skins/windows/visualstyle§ion=browse&qh=boost:popular%20age_sigma:24h%20age_scale:5




