The Asus P5Q-E is a motherboard with an Intel LGA775 socket compatible with 45nm multi-core CPUS. It is based on Intel's P45 chipset.
ESATA Partially Doesn't detect the drive unless you reboot with the device on. Seems to be a general Linux issue, not hardware specific.
Network Yes One NIC fully working with skge. Other NIC only tested with install CD and not working.
Failed to get any of the amd64 2008.0 beta CDs to boot properly. Using amd64 2007.1 minimal boots but with a 2008.0 beta stage3 install downloaded at install time. Kernel version 2.6.25-gentoo-r6.
The sky2 module is auto loaded for one of the NICs and doesn't appear to function correctly. The other NIC uses skge and functions properly after a call to modprobe.
Setup in the bios is easy. Had trouble from the install cd accessing the disks an gave up early. Might need software support of some kind.
Works using the pata_marvell although performance isn't great. Had to enable the Drive Xpert in the bios. Not sure if this was coincidence or a hard requirement. Some troubleshoutings may occur with vanilla kernel lower than 2.6.27_rc6 (non detection of IDE drives). Problem is solved since this version of the vanilla-kernel.
You will need to determine which suboptions to these you need.
See this guide and this guide.