Vlad
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Surprisingly, if you run several memory-intensive programs in any OS, they will load the system so much that it will be a problem on any system:D
So, if you don't demand that the computer run Crysis and Photoshop simultaneously, you can easily live with 1 GB of RAM on Vista, and that's, well, not much:)
Regarding Seven - if it comes out sometime in 2011, then 400-500 MB of RAM is not very serious:D
At the same time, the amount of RAM used did not exceed 1 GB =)
Vista itself (without running any programs) consumes 1 GB.
And Windows 7 is planned for 2010, so we'll see...