Just got word that Arstechnica.com have posted an in-depth bios guide! Here's a snip.

The key to configuring fast and stable systems often involves tweaking the way they operate at the most basic level via the BIOS. While most enthusiasts are familiar with some settings that yield significant performance benefits, many other BIOS settings remain poorly described and may unknowingly play a crucial role in system performance and stability. Wayne Hardman--a.k.a. "Hat Monster"--has written up a detailed article explaining the function of these settings and how to set them properly to have a high-performance, reliable system. BIOS Arcana: description and translation