[Nightracer]

I'm going to track my downloads using PHP and needed some input.

1) I'd like the user to fill out a form with his/her name and email. Is this a good idea or bad? How do most people view this? Do they fill out the form or not?

2) What information should I collect? IP? What good is it? Browser Type? Why? etc.

3) Should I host my files in a database or not? Should I use a download.php?id=file.zip type structure?

4) Is certain referers blockable in PHP?

Thanks