If the developer has there own web site (like for PodTrapper), I like to get it directly from them. They probably get more of the revenue since they aren't paying AppWorld any selling fees.
no really, google "_________ app for blackberry", where the ___________ is whatever you want the app to do. Blackberry apps are all over the web. They're not just restricted to app world or the crackberry app store or any other marketplace.