Hey, bookjetty is so great that I keep thinking to it ... bad side of that is that I come up with features I may like to see in it, and that's a lot of work for our bookjetty (tiny) team :)
OK, so what about "related books"?
What I want to do: I want to say "this book on my shelf is quite similar to this other book seen on bookjetty" where "similar" can be a "same content but different publisher", "a different cover", a "different language" ...
Solution suggestion: introduce relations between books.
Interpretation of "related" can vary a lot, and we may want to be able to say what kind of relation it is, like the "similar content", "similar subject", "similar author", ...
Sorry bookjetty, I'm trashing at you all ideas coming to mind ... do whatever you like with that ;) ... and have a good day anyway! :)