The WorldCat Search API has been enhanced, so that now library developers can build apps that show only their library's results. I know from talking with the product manager and being at the Hackathon and Mashathon that LOTS of people have been eager to see this feature go in. Read all about it over on the Developer Network blog.
The BIG news is that there is a new WorldCat API coming, called the WorldCat Basic API. One awesome thing about it, is that it will be accessible and available to anyone and everyone for noncommercial use.
Did you read that right?
Everyone will have the chance to include library results in their apps? Anyone? Even me?
Yes, I am pleased to report that WorldCat API access is becoming more like the Hard Rock Cafe: Love all, Serve all.
I'll let you know when the WorldCat Basic API is available. For now, if they haven't already requested it, have your developers request a WorldCat Search API key if you're a qualifying library.