Oh get over it.
Noone yet has managed to explain to me why Vista needs about 9GB more than XP
and similar comments - Vista uses some kind of memory caching - it loads parts of the programs it thinks you are going to want to run into the memory, so when you do load them they load faster. If there becomes less ram available, it will unload from this cache to make room. Whether or not caching is a good idea isn't my point - it's just that's the reason Vista appears to use more memory.