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hyperthreading is pretty neat. for raw integer math i've seen a 40-50% speed improvement by turning on hyperthreading - this was on a dual xeon.
i've heard that the bad thing about hyperthreading is the "context switching" that can end up happening with the L2 cache. i didn't see that in my test since it was small enough to fit into the large Xeon caches, but if you're doing a lot of very different things you might not see the same speed boost.
i'd expect that you'd get better performance if you're just serving webpages and using a DB backend or something, though.
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