Wiki: Windows 7.
From the Wikipedia.com article:
IF I buy it, and that's a pretty big if, I hope that it can be customized similar to XP so that it can only use ~100mb of ram or less and still be functional for gaming/general usage.
A friend has XP on one of his computers using about 58mb of ram at start-up and his XP laptop, which is very similar to mine, uses about 157mb at start-up.
Vista on my laptop has been customized so that it *only* uses 384mb of ram (which is down from ~800mb of ram usage...craziness

) My laptop can only hold 2gb of ram, and initially it only had ONE gig of ram! 384mb at start-up is as good as it gets apparently

.
If I do buy Windows 7, the upgraded media center
would be nice, but definitely not one of the sole reasons for buying the OS.