php Site RecommenderThis php Site Recommendation script allows your visitors to enter their contact information and recommend your site to as many recipients as you specify (only one required). The default messages are easily modified. Look and feel is customizable via the stylesheet. You can choose to be notified when your site has been recommended and the notifications will show recipient(s) as well as the message. Email addresses are hidden so they will not be harvested by spammers. Also contains error checking and validation and does not require database access. Most of all, the script is very easy to install!
_http://hotscripts.com/jump.php?listing_id=30168&jump_type=0
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Tell-A-BuddyThis set of scripts lets you add a email refer a friend to your site just upload it where u want it and dont forget to edit the HTML file to match your site!
_http://hotscripts.com/jump.php?listing_id=59005&jump_type=0