Kiilki VS is a wonderful theme that both modern and minimalistic. There are two different setups for it. There is a slim version and there is a regular version. The slim version is more minimal, but offers less overall functionality inside the theme. The theme file comes with fonts as well. Readme is included to answer most common questions.
Use on Windows Vista: Vista Ready. (see help tab if you have issues)
Use on Windows XP : Download and install Theme-Patcher (Instructions included).
Title: Steel Flash 100K
Download Kiilki VS for Vista here