What alternatives to Nano-ITX?

I want to build an extremely small PC and have pretty much got sick of waiting for the Nano-ITX motherboards to be released, so what possible alternative "mini" form factor motherboards are there?

So far I've found Advantech's biscuit range of 3.5" mobos, any others?.....

Thanks

Mini Mac?

hmmmm. those Advantec system boards are pretty sweet looking. The only others i know of are the standard Mini-ITW systems, but then i guess you are looking for something smaller.