I use a JavaScript that creates a browser window for study similar to flash-card programs, though I'm using what was in 2004 the best unit, an SL-C860, probably by now old-fashioned. As I'm in Japan I don't know what models appear out in English-speaking areas, but I'm seeing other lines like 5000's and 5500's, that look like what have come out since then.
When I wrote the equivalent Flash program for a cellphone, it was Flash-capable enough to do the things needed for such a script as taking text from ActionScript and displaying it in fields on the screen, and showing nice renditions of Japanese characters highly enlarged.
In case you're inclined to suggest other programs out there, they probably wouldn't suit since I haven't seen any that allow me to scan over a list of 50 entries at a time, and revise entries right in their display field onscreen.
Whether it's the ability to write text into onscreen div's with JS, or whether it's the ability to run a vsn6 swf file, something more advanced than NF3.0 would be a delight. Such as a better browser or a Flash player.
Is there such a thing out there somewhere that any of you suspect would run on this unit? If SL-C860 is a meaningless model number, to grasp the platform level imagine the Zaurus top-of-the-line (or maybe one below it) in the spring of 2004.
Any input would be helpful.