Here are a few excellent threads, rest assured these are the tip of the proverbial iceberg:
http://forums.procooling.com/vbb/showthread.php?t=6385
http://forums.procooling.com/vbb/showthread.php?t=10825
A few of Incoherents posts have been really good (this will really test my memory): The ones I remember off hand are: 'New block(hysterical post)', 'a tim c/w number', and 'measuring cpu heat output'. <--ok, I cheated hehe
Look for longish threads where msv, 8-ball, Unregistered, Cathar, pHaestus, Les, KnightElite, Since87, Incoherent, among many others (sorry, too long to list everybody, and it is difficult to know who is even around anymore) have choosen to linger. You will usually find Procooling's best contributions in those.
In finding these old threads I have remembered many others. Look around a little more, I doubt seriously that you will find such a collection of knowledge anywhere else on the net in a public, 'non-industry' forum.
OCAU is really good but, in all honesty, the typical contribution there is a little 'lighter' in nature than the typical Procooling contribution. Cathar seems to drive most of the technical discussion I have seen there although, admittedly, I haven't spent that much time there.
I have yet to check out Robotech's site but he is doing some very nice testing so time will tell...
Overclockers.com is very light weight stuff, but good for what it is.
Well, I rarely write more than this for anybody so, see ya :P