Gigabyte GA-EP45T-DS3R (DDR3, only;F4c, the latest). GA-EP45C-DS3x (DDR3 or DDR2) and GA-EP45-DS3x (DDR2, only) should be similar.
All AMAC stuff and a true SATA device tree is implemented.
Installed using iBOOT and the 10.6.3 "retail" DVD, then updated to 10.6.7 using the Combo Update, finally installed the "usual suspect" stuff using MultiBeast specifying User DSDT, ALC8xxHDA and 32-bit (the latter only because I was testing with a 7200GS and not my usual 8400GS or 9500GT).
All ports are working (including both on-mobo R8111 LANs and also WiFi using a legacy PCI Broadcom card).
A good use for an old "warhorse" mobo which otherwise was shelfware rather than hardware.