I have my new CPU cooler installed... the Enzotech Ultra-x.
Here are the numbers that I can't believe! They are all 'under load', running 2 instances of Prime95 for at least 20 minutes.  
CPU temp / mobo temp.
65c/53c = [url=http://www.zerotherm.net/eng/product/CF800.asp]CF800[/url] from ZEROtherm. 
40c/33c = [url=http://www.enzotechnology.com/cpu.htm]ULTRA-X[/url] from Enzotech. [url=http://videosean.gotgeeks.com/i/Ziggo5/Desktop_20070405_3.jpg]1600x1200 - Enzotech under load[/url]
This thing IDLED at 45c with the CF800! LOL [url=http://videosean.gotgeeks.com/i/Ziggo5/Desktop_20070403.jpg]1600x1200 - CF800 Idle[/url]
Those numbers were with the CPU fan at full blast - 2700+ RPM.
Right now I'm not going over 52c/43c under full load for 45 minutes with the fan under 1400 RPM and nearly silent with the Enzotech cooler!

If you want more I already typed here: http://videosean.blogspot.com/
Pics: http://videosean.gotgeeks.com/i/Ziggo5/2007-04-05/