I would suggest against StyleXP. It does something that can be done for free if you know your way around a few folders inside of the Windows directory. The uxtheme.dll hack does this quite well, and allows you to use the skins that StyleXP uses, for free. I guess you could call it illegal, but it's sort of a gray area. The link I am including is a quick google to the most updated hack for Windows XP with Service Pack 3. I don't know if there is one yet for Vista, as I currently don't use it.

http://www.winmatrix.com/forums/inde...howtopic=18059

Also, DeviantArt.com is probably one of the better places to find skins. Here's the link to the most popular skins of all time. I currently use Concave VS, to give you a taste.

http://www.deviantart.com/#catpath=c...lstyle&order=9