Well, postage certainly put a damper on international and even domestic trading, and ebooks for sure. On the other hand, there are a lot of LFLs that spring up so releasing in some way is easier.
I'd definitely love some smartphone friendly feature, and definitely an app in the future. How great it would be if I can spot any OBCZs and LFLs near me on the map. Also, the ability to scan the barcode of a book and get it added to the wishlist, or get the registration process started, will be great too.
Also, using GPS to help w releasing books will be great. Especially, as other said, when we are visiting. I help out with cleaning up the OBCZs as well, and a lot of them are from visitors who have no idea how to look under the regions and cities, as well as location names that appear twice, in both in English and the local language. Yelp check in, for example, shows businesses that are near you, and while it's not perfect, is certainly helpful.
Book cover loading is another issue that I hope can be fixed soon. Sometimes I can see the image on Amazon, but BC search still return empty handed.