Other than the AMD-powered ThinkPad X100e, in fact Lenovo does produce Atom-based netbook called ThinkPad Mini 10. However, the netbook is only available in a school in New South Wales, Australia.
The ThinkPad Mini 10 gets a 10-inch 1024×600 LCD display, instead of 11.6-inch screen you found on X100e. It gets Atom N450 1.6GHz processor.