Intel UMPC running Linux
I'm sure you didn't miss Intel MID, Intel's answer to the wave of UMPC and Internet Tablet. It features Linux, Matchbox and Hildon, all glued together with a distribution based on the Chinese RedFlag. But the more interesting thing is that the core chipset is based on a Pentium M and GMA945, which is much more horse power than, say, the Nokia 800.
Now interesting challenge: while I'm sure it will be relatively easy to have AbiWord and Gnumeric running on it, like they already do on Maemo, but how about porting OpenOffice.org? Sure it will be contrived, but we have a 256MB of RAM, 500MB of storage and a 600-800MHz CPU based on a Pentium M (with half the cache on than the one found in laptops) which should be more than enough.