no one has actually bothered doing a test yet
but all of them have pretty competent antishake
if you're really that interested, since there are other factors to consider imho, so you shouldn't care - you can always look at dpreview's tests, i guess
antishake is just antishake, how competent you want it to be
definitely will not beat tripod in any situation, blah
Well if you're deciding between the 3...perhaps you'd ask yourself which lenses/accessories you wana get after you're satisfied with the anti-shake? coz Panasonic has anti-shake, too, and I like it more 'coz it has shutter release anti-shake. The OIS mode I use with my PnS camera. That means the image is stabilized at the precise moment you trip the shutter. Try looking at the L10.
I like the anti-shake on my E510, tho. Seems good enough for me, but then I managed to shoot at f4, 1/30 secs with my 40-150mm at full telephoto. So I think it all depends on your technique for stabilizing the camera.
For camera body alone, I think the K10D is a very good buy. However, it lacks live view, which was something I was looking for. Moreover, it isn't a 4/3 system camera.