Best tutorials on Sending Email from Flash using PHP

I've tried a lot of tutorials on the web, in order to make a working contact form in flash. Endly I found one: Sending Email from Flash using PHP

The best part of that tutorial is: it points out tons of tips which could drive man crazy without. For example, you'd better hide the send button in a Movie Clip, so that everything works. Why? because otherweise

Note: note that [ send ] is a Movie Clip with inside a button. This is useful for us while with the loadVariables() our vars to PHP without sending all _root variables...

Reading such kind of tutorials is really an enjoy. Keep going on, Alessandro Crugnola!