Ok here is how I figurred how to do the free trial trick (technically):
In my listings for members I will make a seperate link which indicates
"Free Trial" if a member clicks on it an email is being sent to his email
address with a link that contains a key that contains a time based hash
(similar link opt in mailinglist). Clicking the link will set a cookie and redirect
the user to the members area of the site he choose.
I will limit the "Free Trials" to 5 per user per week. This makes sure a user
cannot use more than 5 trials per week. The paysites only have to add
a few lines to their .htaccess to allow access from monkey.
The email thing makes it too much work for leechers to use and even if it
would be limited for use....also I have a pretty complete set of rewrite rules
for site leechers which I can provide to the paysites.
If you see any flaws.......be my guest and shoot
DynaMite