Replace www.yourdomain.com with your actual domain.
Just don’t mess with the user_agent and query_string lines. Those ensure that the Coral servers themselves can retrieve your page when they need to.
(Shamelessly stolen from http://ottodestruct.com/diggprotectionrules.txt)
RewriteEngine on RewriteCond %{REMOTE_ADDR} !^aaa.bbb.ccc.ddd$ RewriteCond %{HTTP_USER_AGENT} !^CoralWebPrx RewriteCond %{QUERY_STRING} !(^|&)coral-no-serve$ RewriteCond %{HTTP_REFERER} ^http://(www\.)?digg\.com [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?slashdot\.org [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?slashdot\.com [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?fark\.com [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?somethingawful\.com [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?kuro5hin\.org [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?engadget\.com [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?boingboing\.net [OR] RewriteCond %{HTTP_REFERER} ^http://(www\.)?del\.icio\.us RewriteRule ^(.*)$ http://www.yourdomain.com.nyud.net:8080$1 [R,L]