I have been a fan of AMD and had been for many years... they still rule the roost in the server market, the Opteron is significantly better than Intels current offerings for most server roles due to memory management.

Unfortuantely in the deskto market they have lost their way and are not providing the same bang for bucck as they used to. I would now definitely go intel even though it would mean changing motherboard along with the processor. The 6600 is not significantly more than the equivalent phenom but has better benchmarks on every review I have seen.

AMD also missed the graphics card market this time around... I think the aquisition of ATI has had an impact on their R&D they seem to be concentrating on integrated chips instead of improving their market share in the high end graphics market.