spritelooks nice, ive had a bad experiance with windowblinds, it killed my version of win 2000 on my other pc so themeing this pc is a big no no. But i whish windows xp had more themes or easy to use themes that wont skrew up the comp.
I have most of the Stardock programs (WindowBlinds, DesktopX, RightClick, ObjectDock), and yes it does requires alot of ram and processing. WindowBlinds aint a bad thing, but you need at least a 512MB RAM computer. Before I upgrade to 1GB, I was on 256MB it was just impossible to run what I run daily with WB. I installed it last week and uninstalled it as my version is old (4.5, 5 is now released) so theres no more new themes for it.
If you want easy themes, StyleXP is the most simple. Its light, easy to use, and simple. There's no comparison with WB as SXP uses ALOT MORE LESS ram than WB. But, its 2 different type of themes, so dont expect having the WB's theme quality with SXP, its impossible...