Once a comic collection becomes rather large, it can be difficult to locate a group of newly added comics that you want to view. You could search for each of them individually, but this can be cumbersome after a while.
This is a patch to add "Sort by" and "Order" radio buttons to the library menu, for sorting the books in the book area by date or path, in ascending or descending order. It adds two fields to the book area's liststore (Added and Path), and sets a method to sort by one of these fields. It also unfortunately required a small change to the library backend, replacing the added column in the book table with a timestamp.
I'm sure it could use some work, and I'd be happy to mess with it if desired. The included patch is against svn from March 20, 2009.