If you can do without LINUX, you might look at the Cortex chips from
STM or Luminary Micro.
(NXP announced, but isn't shipping yet.)
There are boards based on the STM32 available from Olimex, sparkfun,
I believe there are ports of freeRTOS and/or eCOS either available or
being worked on.
Note: sparkfun appears to be out of stock; I just ordered another
minimal board from futurelex.com "ET-STM32 Stamp Module"
This lacks a JTAG connector (and I've never ordered from this Co.
before), but the price ($25 is right for a little experimenting, and
it has more flash and RAM. I guess I'll have to make do with serial
download, for now.
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