you need to list it on different scripts directory such as hotscripts.com http://scripts.com/php-scripts
on google just search "php scripts" or "php scripts directory"
you open first a developer or a programmer account with them and wait for about 24 to 48 hours and you'll get an email if your account is rejected or accepted.
of if you can't get in the way is to become sponsor http://www.sharewarejunction.com/advertise.asp
they have as little as 2 cents per click and the top one is
$49.99 /month
for Featured Application Listing while you're in there for one month those php scripts directory will have interest on your product and allow you to list them for free on their directory
and if the product is that good list it here on http://www.upload.com/
to be available for download.com users
liam_d said:
Any website i try to submit to won't email me back to say if it was accepted or not, it is highly annoying