RealBasic, like Delphi is a great product which is often overlooked. RealBasic supports full OO code, has a nice IDE and form designer, better implementations of most of the VB classes and function, and it compiles programs for Windows, Mac (OS X and Carbon), and Linux.
For some reason Real Software never really markets their product at all, and they seem to be putting less and less effort into it. Although the RB OO system is superior, the RB documentation is not. The level of detail and even up to date information is far below MSDN, and the online community sites are not much better. I think that is a huge blow for people who are trying to migrate to RB, especially VB programmers trying to grasp the OO model.
It's a shame that people put out excellent developer tools and have such poor marketing. Realbasic is much more powerful than VB, and probably would be a great solution for many people. But only if they hear about it...