Suggestion: It would be nice to offer Dutch.
I love the format of this website! I think it would be cool if you guys offered more languages, like Dutch and Swedish. That kind of stuff would be really useful.
If you like detective/crime fiction stories, these are 2 languages that have a lot of good ones. In fact I've been reading Swedish detective stories in Dutch lately. For early forays into reading a language, detective/crime fiction is a good choice, since the vocabulary tends to have a lot of repetition.
I get Dutch books mostly from E-Bay, some from abebooks.com, a few (and the postage/VAT is ridiculous) from Holland, bol.com mostly. But anyone really interested in getting inexpensive 2nd hand dutch books (a lot of mysteries) ought to send me a private message because, Ik heb een plankvol van tweedehands boeken, goedkoep!
A tip for looking for Dutch books on E-Bay: Use advanced search. Here's my designed advanced search for E-bay, eliminates a lot of unwanted stuff with "Dutch" in the title (especially Pennsyvania Dutch, etc) http://tinyurl.com/c73wx63