Hi all, I am doing a PoddCast. Is there any way I can know how many people downloaded my audio files? I post direct download links in my website. Please help me. Thanks in advance.

http://greycobra.com/tutorials.php?tutorial=view&id=32

That site has a pretty good tutorial (in PHP) of how to create a script like the one you are requesting. Read after the tutorial ends (in comments) to view a fix that fixes the links from working.

Good luck!
(if you need help, feel free to ask around, there are many who can help)