Singlefiling Webmonkey and Daypop
The silent launch builds even more thunder. Another couple of highlights from the grapewine:
Hotwired Webmonkey: Get organized with Singlefile, the Web-based service that tracks who you've lent what to, stores data about the books you own, and recommends books you might like to acquire based on the contents of your collection.
Daypop Top #3 search: Singlefile.