Associate Different versions of the same book
As far as I know there isn't a way to do this - but it would be really nice if we had an option to link an eBook and a print book so that their pages would have a link saying "Also available as an eBook!" or "Also available in Print!" - or even hardcover / paperback / special editions of a book.
It just seems strange that we have to market what can be the same content as many entirely different products that can't connect to each other through lulu except via spotlight. Mostly this is very unintuitive for shoppers who might discover content through Lulu.