I modified tiki-edit_templates.php?template=templates/mail/user_validation_mail.tpl
I added:
Subscribe to Tiki@Freshmeat
This improves our popularity ranking and helps us attract more users. You will be informed of new Tiki releases.
http://freshmeat.net/subscribe/31717
Please create your User Page. Tell us about yourself!!
http://tikiwiki.org/tiki-editpage.php?page=UserPage{$mail_user}