There have been several intel based MID/UMPC designs that don't fall into the netbook category. Most of them predate the Atom, however.

Samsung Q1, Q1 Ultra
Sony Viao UX
OQO's line
Gigabyte's older slider (that's similar to the OQO and Sony)
WiBrain's brick/tablet (now owned by iKing I think)
a few other non-sliding/non-convertible tablets of varying sizes from lesser names than Sony and Samsung.