I use my recently added books feed from LibraryThing, a site I've mentioned before where you track, review, recommend, and share your books, and I put the recently added books on my page. I thought it might be nice to include the book covers so I suggested adding book covers to RSS feeds in LibraryThings 'Recommend Site Improvements' group. The next day I had a response from the founder and lead developer Tim Spalding who had started implementing the feature. I noticed a few bugs, reported them on the same thread, and he fixed them soon after. Fantastic! It makes me want to upgrade to a paying account.
Incidentally, if you notice the Ghost in the Shell book appear multiple times in my RSS feed its due to the previously mentioned iterative bug fixes. The same item appeared multiple times slightly differently with each bug fix and your RSS aggregator may have picked them up as distinct items.