JaxCat Search Gadget

I now have the search gadget on my blog and igoogle page. What could be the purpose or usefulness of this? If I had a blog about what I am reading or what books I recommend, then a local reader of my blog could use the gadget to see if JPL had the book available. A reader who does not live near enough to use JPL could use the gadget to get further information about a book so that he could go to his local library or book store.