Depending on if what your solution can do I was just going to use this to turn off/on the ATX power supply. I am running the Avalon Chips off of PCI P6 and adapter to P6.
This is my exact plan. I will use this breakout board only to power the ATX power supply on essentially. However I am intrigued by what ik2013 is working on and when more details are posted I might be considering it if it's an elegant solution.
Well I got an email from OSHpark a few minutes ago regarding the boards shipping today so I should have something to show off this weekend

PM me if you want a sneak peak at the Arduino code. I have added renders from OSHpark to tease you guys
Please note in this version of the board I left off the pull-up resistor for the case power switch. That has already been rectified for the release version, and should be a simple fix for the boards on their way to me.
https://docs.google.com/file/d/0B4W8A-jNaqN1RlBnRjlfS3laWjA/edit?usp=sharinghttps://docs.google.com/file/d/0B4W8A-jNaqN1eDF1d0dORE5JdG8/edit?usp=sharing