From the report at CNET, it seems its limited, perhaps that's a temporary thing?
http://reviews.cnet.com/e-book-reade...?tag=mncol;lst
MY BAD, If I had read instead of listened.....
It's worth noting that initially Barnes & Noble said the WiFi connection would only work in its stores, where Nook owners would have have access to exclusive offers and free browsing of complete e-books. But later a PR person emailed us to say that, "The Wi-Fi connectivity will also work on other Wi-Fi networks to give you access to browse and download from the company's digital store at fast broadband speeds."