Check this homemade WB out
Aircooled WB
This guy is claiming a 9c temp improvement over a Heatkiller LT. I'm not sure what to make of this. I just can't see that happening.
EDIT (by shazza): a bit late adding this edit, but since this is the first post in the thread, I've taken the liberty of adding to Sideroxylon's first post - Before you add a comment to the thread, please read the quoted source. The point of nateman_doo's waterblock - and a point he emphasizes in the quoted post at EVGA is to make a hybrid block that can work on air and on water. Yes, he does say that his block beats the Heatkiller by 9 degrees - BUT a very important distinction is that he's saying it beats it in HIS setup. He's not saying it will beat the Heatkiller by 9 degrees in all setups. A point of emphasis on this block is the fact that it can reportedly act as a satisfactory heatsink for either air or water cooling.
Just want to make sure everyone is clear on that before they post their comments.