A World Of Hello Worlds

A Hello World program (as I am sure you already know) is the first program anybody writes when tying to learn a new programming language because it teaches the budding programmer how to output useful information to the user.

This Wiki page has a list of hello world programs from what appears to be every single programming language ever created. It doesn't go as far as doing different flavours of languages like Basic, QBasic, Visual Basic and so on, but it does seem to have one example of a Hello World program for every mainstream programming language in existence.