Sorry I've been too busy to post this week. I did find this link that I thought you'd enjoy, though.
15 tips to properly setup your own hosting racks.
You don't necessarily have to be setting up hosting racks to use these tips. There isn't a lot of depth to the tips, necessarily, but they are good to keep in mind.
I also did a HOWTO on Racks and Rackmounting a while back that you might not have seen.