I've been looking expectantly at
oloqt for some time, but it's all in Japanese so it would need some work to understand the docs and translate the UI, but from what I could gather this program lets you gather data from mail servers, RSS feeds or just plain web sites and browse them later when you're offline. It seems very powerfull with some advance scripting features, but of course this is mostly blind guesses because the doc is all in Japanese and all I did was capture (and translate with Excite online translator) all the docs I could get, in order to have a look later, which hasn't happened yet...
Maybe this program can be translated and the appropriate script could be written to capture this board to read it offline? For the time being, I use plucker (or more exactly Sunrise on my Windoze laptop) to make a snapshot of some of the board's forums and opie-reader to read the files on the Zaurus. The problem is that the formatting is lost in the process, so reading big threads can become tedious, but it's better than nothing, I guess...