I love AMD and their processors because they offer competition to Intel and Nvidia on the CPU and GPU front, plus the 2500+ Barton will always have a special place in my mind.
Since first owning the Athlon XP 1800+ I've used only AMD processors. They've been rock-solid for me. Still using an 2500 Barton MP in my current PC, so it may be time to upgrade to one of the new-fangled multi-core offerings.
I love AMD because their x64 processors helped push mainstream use of 64bit computing. My first processor from them was a x64 3700. Great cpu, oc'ed like a champ.
But as for AMD. Where would we be in both the CPU and GPU market? Spending probably 30+% more on both product lines without competition. NVIDIA and Intel both have stiff competition