Hi Kevin,
That is correct - it was a simple unit conversion app for a client that had no database connectivity at all.
That's not to say you CAN'T have database access. You just need to make remote AJAX style calls to a hosted back end somewhere within your Javascript in the app. I suppose one way you could get around this is to have the NetTalk app hosted on a server somewhere, then write a small wrapper app with just a UIWebView that is hard coded to call your NetTalk pages on your server.
However I think that the Apple store in particular frowns upon apps that do this, and it might be VERY difficult to get it past their approval team. The second downside is that your app will ALWAYS require an internet connection and cannot run 'offline' (i.e. when the user has 'Airplane Mode' on etc.).
Cheers,
Devan