Geekfish's idea about learning through games is an interesting approach.
I've been leafing through the мир и человек soviet-era atlas every now and then, as the labels are about my reading level, while the body text is a big stretch.
But there's a russian version of TADS and a форум об interactive fiction so someone taking a more active approach might find some games over there. (and come to think of it, the usual complaint about IF —that playing "guess-the-verb" is no fun— may be a feature when it comes to language acquisition)
(One of these days I'll have the reading speed to follow the IM "convo" in Суходрочка, but for now I would bet it is almost completely in a register unlikely to be useful)