Lots of resources, not sure how useful they might be.
Community Review for Gutenberg Literature
My Take
I think this might actually be most useful as a low-cost source of literature in a classroom with tablets, or as a source of background material/out of print documents that might help contextualize a historical period being studied in history. There's a lack of critical context however, that makes it's utility seem limited.
How I Use It
Useful for searching for and finding certain works of literature in ebook form and for finding a treasure trove of historical documents (a bookshelf of French history, bestsellers from 1920). More useful for background historical documents than anything else. Literature itself isn't well contextualized. Also, buggy when I used it: there were several shelves I couldn't access because the "server" was down.