I wrote a half dozen lines of not very pretty code and turned the Ann Arbor District Library's new holding lists into a wall of books display for non-fiction and for fiction. (I would have done DVDs and CDs too but the catalog doesn't have enough images to make it worthwhile.)
It was relatively easy to do because the catalog has an RSS feed. The code is fragile - it will break on the slightest change to the catalog formatting - though I have a sneaking suspicion we can fix that with some relatively simple microformat coding. The same principle should work with any catalog search, or with any other AADL feed (patron checkouts, holds, checkout history).