Lazybase is a web-based database app that's not flashy (or even AJAXy), but clean and easy to use, and works. It's a registrationless service, so to create a new database by just giving it a name and e-mail address. When you create a database you're given two URLs, one that lets people edit the database and another that's just for viewing. Though simple, Lazybase has a few nice advanced features like graphs and maps, relationships (like books to authors), import from Excel, RSS feeds, and bookmarklets. It also has a feature that lets you embed a live database view into any web site. If you're looking for an easy, free way to keep structured data online, Lazybase is worth a look.