Mikelane, thanks for this input! I just confirmed yesterday that this board also works with ESX 3.0.2:
MSI K9AG Neo2-Digital
This board is really cheap, has an ATX formfactor, has three PCI slots (plus PCI-e x16 and two x1s), onboard VGA and supports up to 8GB of memory. Testconfig:
MSI K9AG Neo2-Digital
AMD 64 X2 6000+
2x 1GB DDR2-667 dimms
1x Adaptec 2940UW
1x SCSI hdd 146GB/10000
1x Intel pro1000GT NIC
Onboard NIC is not recognized as expected. Strange enough I got an unexpected error during the install from a 3.0.2 update1 CD, just before the copying of files started. My guess is that installing 3.0.2, then upgrading to update1 will work (not tested though)