ASRock's Q1900TM-ITX is the first Bay Trail Thin mini-ITX motherboard available from a major player. At only 20mm in height, it will fit inside all-in-ones and super small cases, like SilverStone PT13 or Morex 557. With an integrated cooling solution (low profile but thick aluminium fins) and an external power adapter, cable management will be minimal.
✓ Celeron J1900 (4 cores @ 2,00 GHz, up to 2.42 GHz)
✓ 2 x DDR3/DDR3L SO-DIMM slots
✓ 1 x PCI Express x1 slot
✓ 1 x Mini PCI Express x1 slot
✓ 2 x SATA3
✓ 1 x USB 3.0 ports
✓ 3 x USB 2.0 ports
✓ 1 x HDMI
✓ 1 x VGA
✓ 1 x Gigabit Ethernet
✓ 1 x DC Jack
Update: Available next week for 110 euros.