It certainly should be possible, @TheGuyWhoLovesChill. In the old days it was possible to get a ZSomethingOrOther database for Palm IIIx devices which was the whole of Wikipedia. I’ll have a look around for conveniently compressed DB dumps 
(update: http://en.wikipedia.org/wiki/Wikipedia:TomeRaider_database was the Palm thing!)
(update update: it is possible, indeed. But a full wikipedia dump is pretty large, even compressed. It would be perfectly possible to write an app which read these compressed dumps, and indeed someone did a few years ago for desktops (http://owi.sourceforge.net) and there’s also http://offline-wiki.googlecode.com/git/app.html which is a web app whihc caches it all and works offline.)