yeah, just can agree to the previous posters.
perhaps there will be some extensions (does this app has an extension interface?).

but i wanna add one point... perhaps also add a feature to see which books you have borrowed from friends. i don't know if it makes sense, but adding an item is quite ieasy, and if there would be some kind of reminder when you have to give it back.
and perhaps also a collaboration feature to see what other users in a network have (or is this feature already existend???)

although this... a good start, but still a lot of work to do.

max

PS: forgot to mention, that i could not add "Smoething gotta give" DVD, as DL always added this item as a book