Once Intel announced their dual-core Celerons it was only a matter of time until AMD countered with dual-core Semprons. The bad news is that they're mainly available in China at this time, but that could change in the future. Here's the specs on the dual-core Sempron:
“AMD Sempron 2100+ processors adopt a 65nm process, and have a core frequency of 1.8GHz. Pricing in the China market is set at RMB 399 (US$55).”
There is no word on when or if these particular CPUs will be availble in the U.S. but we don't think we'll be waiting too long.