Site Links from Lea Verou

site-links.css

/* Start site links */

a:before {
	vertical-align:-2px;
	margin-right:5px;
	width: 16px;
	height: 16px;
}

a[href^="http://twitter.com"]:before {
	content: url(favicons/twitter.png);
}

.bbpBox a[href^="http://twitter.com"]:before {
	content: "";
	content: none;
}

a[href^="http://lanyrd.com"]:before {
	content: url(favicons/lanyrd.png);
}

a[href^="http://slideshare.net"]:before {
	content: url(favicons/slideshare.png);
}

a[href^="https://github.com"]:before {
	content: url(favicons/github.png);
}

a[href^="http://flickr.com"]:before {
	content: url(favicons/flickr.png);
}

a[href*="linkedin.com"]:before {
	content: url(favicons/linkedin.jpg);
}

a[href^="http://dopplr.com"]:before {
	content: url(favicons/dopplr.png);
}

a[href^="http://last.fm"]:before {
	content: url(http://cdn.last.fm/flatness/favicon.2.ico);
}

a[href*="smashingmagazine.com"]:before {
	content: url(favicons/smashingmag.ico);
}

a[href^="http://functionsource.com"]:before {
	content: url(favicons/functionsource.png);
}

a[href*="opera.com"]:before {
	content: url(http://my.opera.com/community/favicon.ico);
}

a[href*="netmagazine.com"]:before {
	content: url(favicons/netmag.ico);
}

a[href^="http://css-tricks.com"]:before {
	content: url(http://css-tricks.com/favicon.ico);
}

a[href^="http://dribbble.com"]:before {
	content: url(favicons/dribbble.ico);
}

a[href^="http://www.alistapart.com"]:before {
	content: url(favicons/alistapart.png);
}

/* End site links */

Love this bit from Lea's site