Agreed with this post, except... (sorry to kind of hijack the thread a bit)
When I installed win7 a while ago, not the RC, on a 50gb Partition just to try it out... It filled it up right after installing it. I didn't install any other programs either....
This wasn't really a turn off as I have 1tb internal, and plenty of storage externally. Any idea why I had that happen to me? I will probably install win7 RC on my next reformat instead of vista ultimate.
Turn off shadow copies, system restore, set your pagefile to a custom size, etc. Things like that; I did all of that, and my installs have all been low-space consuming.