Yeah, they're better. But not by a whole lot.
They use DDR2 RAM which is a lot faster than DDR RAM. They also require a little bit less power. That's about it.
I have the AM2 4800+ @ 3GHz. It's not the best, but I'm happy with it.
EDIT: Oh and I'm not sure why AMD skimped on the cache sizes...kind of lame if you ask me.
Intel Q9400 | Gigabyte EP45-UD3P | G.Skill 2x2GB DDR2 1000 | XFX HD5870
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