thanks dfnkt, i also got that email. i decided to give it a try, and downloaded the 64bit enterprise eval. i installed it on my HTPC running an athlon 64 4000+ with 4gb ddr, and it was so chunky it was unusable. on the system monitors and task manager, it showed the CPU utilization at 100% even on idle.
i'm guessing that old CPU can't really handle 64bit, so i will give 32bit a try.