A nifty article on hyperthreading on linux has some benchmarks and explanations of what it is and why you want it. Anyone who wants to see the UFies.org box running on a HyperThreading processor feel free to click on the little donate button to the right :)
All I can say is Dual xeon hyperthreading!!! I'm working on it for next years Ufies upgrade. That should be a sweet box!
PS. Dont' feel afaid to dontate to the costs Al puts up for his share of the box.