On the Kobo readers, when you open the library > Books, you have the option of showing books sorted on All, Reading, Unread and Finished. You can check the Reading option to view all books you are currently reading. This can be further drilled down by choosing - Sort > Recent, Title, Author, File size and File type.
I think this could help you. As I'm not in Kindle camp, I may not be able to suggest anything about Kindles.
