V.V.V.V.V.
Houses Ov Mercury
With 1 gig of ram on XP pro, I can run Photoshop, Illustrator, Winamp and a virus scan all at once with no slow down.
^ You forgot one thing: people like to be able to run other programs on their computers too without it choking. The goal isn't just to have a computer that's good enough to run Vista alone.
With 2 GB of RAM on an XP machine, you could like scan for viruses, check your e-mail, surf the Internet, and play a high-end computer game all at once.
Vista can't use all of 4GB btw.
I have 3GB RAM in my core 2 duo 2.4 Gz laptop and vista runs reasonably but it does generally kill itself if you try to multi task.