Hey guys,
I recently bought a Mini, 2.4ghz, with 2 Gigs of Ram.
At first I thought that wouldnt be enough Ram to keep the System running smoothly. But surprisingly it was. OSX reacted fast and handeled all my Software great... until I got Parallels Desktop.
With WinSeven running in the background the Mini was totally down. The Ram was cut between OSx and Win 1Gb/1Gb and it was impossible to work on the Mini. So I upgraded to 8Gigs of Ram and now everything works totally smooth, even with Windows Seven working in the background. The Mini works great now without any slowdowns whatsoever.
My conclusion: if you dont want to use a Virtual Machine or very heavy tasks in OSX (HD Video editing and stuff) 2 Gigs will totally do.
If you want to use Parallels you HAVE to upgrade