I think the framework is in fact the best solution. Though it'll take some time it is better than having several readers with basically the same purpose (mobipocket, iPDF, FB-Reader, minimo for html, ...) and every single one occupying in the sum more time than one big effort. I love mobi-pocket books for their dictionary support, but the menu bar and pages row sucks, if one knows how beautiful it can be with fullscreen-iPdf.
I'm spoiled from the Palm eReader

and it's options.
So I hope the best.
cheers,
Nergal