Okay, I think the example above is a bit misleading, <b>most</b> apps (and only ones written for HT) see about a 10-20% improvement, which is still notable...however, with dual core tech just around the corner, one should plan system purchases accordingly. Unless you <b>need</b> the best <b>currently</b> available.
AMD is sure to have a good lead in this area (dual core), and will likely see much more significant performance improvements than Intel's HT with these same apps.