I`m a total newbie and I wan´t to build a Mac OS based Homeserver/HTPC. I just found this board with HDMI:

Point of View POV/ION33

Processor Intel Atom 330 - dualcore 1,6GHz
Chipset Nvidia MCP7A-ION
Graphics chipset NVIDIA® ION™ GPU
Audio chipset Realtek ALC662 5.1CH
Memory Max 8GB DDR2 SO-DIMM
Supported memory speeds 667/800 MHz
Graphics output DVI/HDMI/VGA
Audio output Optical SPDIF, Stereo in/out
USB connections 6x USB 2.0
SATA 4x
LAN 1x 1000 Mbps
Expansion slots 1x PCI-Express 16x
Other connections PS/2, Internal COM
Form factor m-ITX

Will this work?

Theres ppl with OSX in atom system, you can check in the HCL, but I think theres no support for that ION chipset :/ you can always ask in irc.osx86.hu #hackint0sh, good luck and report back