Looks like I satrted something!

I create the occlusion look using the technique that THX uses, the layer version that tweetytunes mentioned seems to come out a but washed out whenever I try that method.

If it looks blotchey your best off upping the number of samples in the occlusion node untill it comes smoother, I usualy go 64, 128, 256 etc (dont really ever go over this value)

Theres lots of other ways to do an occlusion render, light domes, GI joe, lots of spotlights etc, I even remember a hack (highley advanced workaround) that you set your material to black, up the reflectivity to 100% with a totaly white reflection map, render it with raytracing on 1 bounce, thats if your 3d package dosent have a ambient option in it!