http://ark.intel.com/products/56462/Intel-Desktop-Board-D2500CC
d2500cc -> just released this week or so (about last week or so i checked and it was not available yet).
Intel board - nice
Intel chip NIC (Gb of course) - nice
dual port NIC - now that's what made me buying this board
10W TDP
mini ITX
atom D2500 CPU - not too slow (passmark doesn't have a value for D2500 yet but i expect it to be faster than D525 and slower than D2700, which should still be pretty decent nevertheless)
D-sub + DVI
PS2
i think it also has one mini express card slot if you want to put wifi card onto it.
from what i can see, only thing missing is DC input (see DN2800MT, 8v ~ 19v DC input onboard, very handy)
however this can still be over 20W though. i have a intel D525MWV board + seasonic SII 330W PSU (80 plus) + 3.5" hard drive + intel PCI Gb NIC -> all this comes to 30~35W. well if change 3.5" into SSD then maybe it can be close to 20W i guess.
alternatively can consider going the DN2800MT route. it is rated at 6.5w TDP but with one NIC only. however the final box would be quite a lot bigger as it'd need a PCI NIC.
i bought one D2500CC today together with Aopen S100 case (with 65W DC adaptor). if you don't know what S100 case is, you really should take one second to have a good look at it.
currently considering if should buy one SSD or 2.5" HDD - many thanks to thai flood, interestingly, it's cheaper to buy an intel SSD 40G than buying a 320/500G 2.5" HDD…
can't wait to get my first pf box running :)