Don't get me wrong. I like Bento, but I also have the OSX app, which makes it easier to manage and extends the features. With both, the iPad makes a pretty good tool for gathering data, and looking it up. Without it's only an ok tool. One of the things you can do with the OSX version is create smart catagories. Very nice. They transfer to the iPad, and continue to be smart.
That said, I havn't seen a better general purpose database of the iPad. HanDBase is probably the closest, but reviews show that it is not as stable as Bento. Along with not finding a satisfactory way to sync it with my Mac, I'll stick with Bento.
I suggested the Recipie apps because when you only have one use for a database, you'll often get better results with an app tailored for it. It is always worth looking around for that perfect app before resorting to a general database. Unless of course you have dozens of database applications, then the price of one vs dozens of apps starts to come into play.