vLite - Windows Vista Lite Install Tool
 

Windows Vista from Microsoft takes a lot of resources, we all know that. vLite provides you with an easy removal of the unwanted components in order to make Vista run faster and to your liking.

"Looked at some stats and it turns out that when a 1GB machine is used with the Vista Lite, vLite can save you up to a 600MB ! of free space in the RAM memory compared to a full version. I find that amazing, and the general usage is much faster even on my Core 2 Duo. Not to mention the 5GB smaller install.

http://www.vlite.net/