OK, so time is very precious to me at the moment, thus the short posts...
Having had time to take in all the specs of the new Intel Based Mac Mini, I am a lot happier with the specification. The Dual Core version is the one to go for and from what I have read about the integrated GPU, I think that if you load up your mini with 1Gb or more of RAM things should move along sweetly.
I do not think for one minute Apple would have released this if it was going to bog down the system with paging to the main RAM for graphics use, so I would not worry about it.
The Mac Mini was NEVER designed for high end games playing anyway, so this is a good move on Apple's part.