A specific script that you have written? Is it open source or are you selling it? First step is to have a demo site, I guess.
Of course, demos, free versions, docs and support available. It was written by our developers company. The source is fully opened, but commercial usage only for license owners (paid version)
You or your company can sign up with http://www.hotscripts.com/ and as a member you can list your scripts there.
Thanks for reply, we use hotscripts services near 4 years. May be there are any "special" or "magic" ways of php scripts promotion that we don't know?
Yes, what does your script do? I was going to suggest hotscripts.com as well - but depending on what your script does, there are going to be other places.