Fictionwise still has a lot of content not available elsewhere, and aggregates a number of publishers who aren't on the agency model. Its non-DRM'd multiformat books are still a good bargain.
However, if it's going to succeed as an ebook store on the basis of those books, it'll need to rethink its whole marketing strategy. I suspect that B&N is willing to let it die rather than find a way to capitalize on its history & broad customer base. B&N is invested in their own ebook format & device, and has no reason to promote a store whose best feature is many books that are readable on anything.