I was wrestling with the same exact question... first looked at lifebooks, then the sony u101... hoped for an oqo release... etc...
and recently got a 760. I think it\'s pretty decent, at least for writing code... but my requirements are low -- editor of choice is vim and I wasn\'t planning on trying to compile anything on the z.
the 760 has been pretty neat but not without it\'s frustrations. It\'s super-portable but the screen is small. I think the keyboard is pretty decent for what it is... but i don\'t touchtype anyhow. It _is_ much slower but, i\'m hoping i\'ll get more facility with it. The whole rom flashing thing is pretty new to me, which mostly reflects my ignorance of embeded systems in general, but... it can be pretty frustrating -- I flashed with a corrupted rom (bad download) the first day I had it and had to run out for a cf reader to fix it :-).
None of the roms i\'ve tried are quite perfect for me. I think, eventually, the x11 rom will be what I want, but... i\'ll probably end up cross-compiling ratpoision or something for it -- i really don\'t want separate windows on such a tiny screen.
All in all, it\'s not a perfect solution, but I think it\'s one of the best things out there. The biggest problem I\'ve had really is that there are so many options for how to set it up that I haven\'t actually gotten any real work done on it yet...
The real question is: do you want more portability or more power? for me, I went with portability. It *is* groovy to have a pocket sized computer with linux.