Yonah preview over at Anandtech:

Here

It did well considering it's amazing low TDP, but I think some people will be disappointed. Still, I'm sure that Yonah will look amazing when overclocked

The motherboard Anandtech used was a desktop version, with all the bells and whistles. So, we'll definitely see motherboard manufacturers making special motherboards for those of us who wish to use a mobile in our PCs.