Thanks Tweek,
I am personally big on effective and quiet air cooling right now. I am in the process of saving up to build my Dual 2.8Ghz Xeon rig (w/ 3GB of ram, and a nice array of 15k 36GB U160/320 HD's). I know those things will crank heat, so I am looking at ways of cooling them without water (because the machine runs 24/7 I dont want the maint. headaches of a H2O system), and because I think I can do it with air if its designed well enough.
Also the Xeons will tollerate some higher temps and remain stable, I dont plan on OC'n them at all (wiht 4 theoretical 2.8Ghz CPU's who needs to OC?

)
So when I get that project started you will prolly see some articles happen covering my experiementation with air cooling designs.