Great software just discovered (thanks to Bink): Longhorn Transformation Pack 7.
This software will transform your Windows XP (and SP2) or Windows Server 2003 into the best looking Longhorn port that is available right now, without any extra software!
Really interesting, expecially for the powerful visual styles. I need only a pc to test it... 
Downloads available from here:
Download - Mirror 1 - Big thanks to Bradd from Falcon!!!
Download - Mirror 2 - Big thanks to itzjonjon69 from D2Imaging
Download - Mirror 3 - Big thanks to Myriad from Winnovate
Download - Mirror 4 - Big thanks to SoftNews.pl
Download - Mirror 5 - TCMagazine Fileserver