Vintage Portable Computing Suggestions?

Guys, I used a Cambridge Z88 for Retrochallenge last year (see http://www.retrochallenge.org for last competition) whilst on holiday. The summer challenge runs in the month of July - entries will be welcome anytime by email to me mark at wickensonline dot co dot uk. This year I'd like to use a different, portable computing device to document this year's summer challenge, and possibly include a little programming. My criteria are: * no larger than a Cambridge Z88. * daylight readable screen. * operates on batteries. * preferably with some kind of programming language/environment. I'd welcome suggestions from members of the list as to what I could take this year that would be fun to explore but also practical enough to use day to day to write text for the website. I will take a laptop for uploading text via wifi, so some sort of PC connectivity is a must (although this could be as simple as an RS232 cable). Many thanks, Mark