I'd like to hear others opinions on the subject of documenting applications from a programmers standpoint.

I ask this because I have seen a company who wrote and sold a fairly successful application get sold and have the key programmer leave (get a big payoff why work). The problem has become (I haven't seen their code) that the programmers taking over have had a very difficult time understanding the application. Remember I don't know the details.

In my case, I have developed a rather large commercial application (200+ tables) and there are several UML models that have been made to diagram the code. I feel that this is the proper way to do things, but when I go and look at the universities' course offerings there is no UML language course. We're a small shop and the use of the UML Language seems to me that it should be taught in software design 101.

So, after rambling my questions are:

Should I continue to document with UML with the thought that there are actually lots of programmers out there using UML that could utilize the models when I decide to hire or contact with other programmers?

Is there a tool to reverse engineer a VFP project (uses MMortals) into UML models?

Thanks
Jon