In my travels LOOKING up the T2400 CORE Duo Mobile Processor that I may be installing into a laptop as an upgrade to the Celeron M, I found a link to this INTERESTING ITX motherboard that accepts a Socket-P Mobile processor and someone ended up building a desktop computer with a Mobile CPU.

To me, unless you are building a small computer or are looking for low power and low heat emission system, you might as well go with a regular desktop CPU with better performance and mATX or ATX motherboard.

Its name of FUZZY to me made me laugh,.... MAYBE that was its intent.

I have one ITX motherboard at home and its a Zotac Socket AM3, and I use it for my WHS, but its running just as powerful as a mATX or ATX system would since its a Desktop CPU Dual-core running in it. I bought it because it was on a sale that placed the ITX cheaper than mATX at the time and I didnt need the extra PCI slots etc.

http://www.msi.com/product/ipc/Fuzzy-945GME3.htmlThere have been a few boards allowing you to run laptop CPUs on them. They made more sense a few years back, especially when Pentium 4/Athlon 64 were the mainstream CPUs, because the Pentium M performed better and used much less power than the Pentium 4 desktop CPU. The AMD Turion was also an alternative to the desktop Athlons as power usage was much lower.
Nowadays it's not really a major thing as desktop CPUs, especially at the lower end or the special versions like the T and S series from Intel, use little ENOUGH power that a mobile chip doesn't save much.
If I remember correctly the Fuzzy was billed as more of an industrial board, for specialised uses.