I have 4 gig of ram, and have never looked back.
But I'm just running Defraggler for the first time (lovely) and look there... in the middle of my hard drive... is the Pagefile... horrible earwax coloured thing.
It's not being used... but it's still there. Cheeky monkey...
dya think I should force it to exist as a tiny space.. then turn it off....cos its a huge part of my hard drive partition according to defraggler