The Sony site doesn't say anything about wirelessly getting library books, just that you can get at library books.
This is part of the Overdrive program a lot of libraries have jumped on board, as Overdrive uses Adobe's DRM for the lending process. Because of that, it works with pretty much all the Sony Readers.
The only wireless access I see the 900 getting is to Sony's store. So periodicals, paid books, and probably Google Books that you can get through Sony's store today.
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