I'm still itching for a BPAL iPhone/iPad/Android app That said, I wouldn't even know where to begin coding one.
Well, it's not a BPAL-specific app, but I really like the Android app Memento. I think it's geared toward keeping track of collections and household inventory. I have it on my phone and I've got about a third of my bottles in it so far. I don't know the first thing about databases, but I've managed to wangle it around so that I have the info pertinent to me (name, collection, when I got it, the notes it contains, if I've tested it, if I think my manthing would let me put it on him, short testing notes, etc., etc.). I like that I can sort the lists any way I like and I can search for anything in the records - all Weenies, all scents including vetiver, all scents I rated with 3 stars, all scents I haven't tested, etc. You can apparently sync your databases with google docs, but I don't know anything about all that. It's really a great little app overall and I'm glad I found it! I thought I posted about it here, but I guess it was in another thread.