Just thought I'd chime in and say I made the move over to Intel
I needed to get serious, and working with an AMD felt like playing with a little toy. I'm not sure what my experience will be like with this new setup, as I've only just put it all together, but I installed from the Retail DVD, replaced a few kexts, and it's running beautifully so far. Just to give a little perspective:

AMD 3800+ (2.0ghz stock)
1GB 400mhz RAM
Nvidia 8800GT 512MB
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xBench score = 116 (at best, with no disk test)

Intel 6750 (2.6ghz stock)
2GB 800mhz RAM
Nvidia 6200TC 64MB (old school)
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xBench score = 230 avg. (no disk test)

I'll be testing out my new system with the 8800GT later, but will probably keep the 6200 in it just because I still want to use my AMD for gaming. Also, I may be swapping out the E6750 for an E8400 in a few days. Either way, I really can't complain about a 100% performance increase.