I will post up a Youtube vid tomorrow, 13"/2gig/256ss, I have yet to beachball it and have tried to crash the damn thing for a few hours today with no luck.
It showed 27mb FREE in Activity monitor, I had iPhoto pushing some photo's up to Mobile me, iTunes streaming the Apple event, Safari up with 12 tabs and DL, then playing 1080p trailer for Transformers 2, then just for the hell of it opened iCal, iMovie, iChat and Mail. I don't normally have this many things going at once and after at least 30 mins of messing around and taking some video with my iPhone I gave up, it clearly is enough ram for what I need. Activity monitor showed many, many times less than 30mb of FREE ram, but the system never beach balled, never became slow or unresponsive when going thru some photo's in iPhoto and remained responsive in safari even with two video's streaming while iTunes kept streaming the Apple event video.
This similar test on my 2010 mini would bring it to it's knees, beach ball for days, if it's the SSD storage then it's very impressive that OSX is probably able to use a swap file and make the system stay very useable even when loaded down.