I find bookjetty very useful to create a "shopping list" before I to the library to pick up books. I'm wondering whether it would be useful to have a "shopping list" category (perhaps by another name) to separate this temporary list of books you have a slight temporary interest in from those you want others in your social network to see you have a definite interest in reading. The downside is it may complicate the interface and that is one the best attributes of bookjetty IMHO.
just my 2¢ worth of suggestion… perhaps you can find some inspirations or strategies to tame the over dose of information (folksonomies?) from this book: