"Intel segments the market intentionally!"
Don't forget virtualization. With AMD, you don't have to pay a premium if you plan to run virtual machines.
You no longer have to pay a premium with Intel either. I've noticed that Intel recently began adding their "Virtualization Technology" to all new CPU models, even their entry-level Celeron and Pentium Dual-Core lines. Example: this $53 Celeron E3200 at Newegg.
I think Intel did this in response to Microsoft's announcement of Windows 7's "Windows XP Mode" and its requirement of on-CPU virtualization technology. AMD also recently started adding their "AMD-V" to their previously-excluded Sempron line of CPUs. Newegg has one for just $40.
For a long time (since the Pentium D days), Intel had a confusing market segmentation strategy where some models had it and some didn't, even within the same CPU family (Pentium D, Core 2 Duo). In contrast, after AMD-V was introduced, AMD added it to all of their newly released Athlon 64 and x2 CPUs (but not Sempron). And after the Core 2 Duo was introduced and kicked major butt, AMD dramatically dropped their prices, resulting in cheap AMD virtualization platforms.
Anyhoo, AMD isn't the only option anymore for cheap virtualization.