Is there a Wordpress plugin for "send this link to your friends"...
 

Is there a plugin for Wordpress to allow surfers to forward the current page, post, etc. to their friends' email addresses?

yes,
"WP-EMail 2.07" -> lesterchan.net
"Send to a Friend" -> lostpixels.nl/staf/

Check this topic also http://wordpress.org/tags/friend

LESTER CHAN ROCKS

his plugins are the shit, I wish he would work on more though

http://www.lesterchan.net/portfolio/programming.php

for more of his plugins

Thanks! :thumbsup