List of Useful jQuery Plugins

http://ping.fm/cmpTx

Facebook user behavior model & MTA

An article showing some user behavior intelligence @ facebook, It looks like a craze of facebook, i’m personally not impressed with it. People used to say similar comments @ microsoft then google and now @ facebook.
http://www.behaviormodel.org/triggers.html

One more thing … facebook is using ecelerity as MTA (as in email content header of facebook emails)

Received: from [10.18.255.175] ([10.18.255.175:40036])
by notification+yy0cfcf9>)
(ecelerity 2.2.2.45 r(34067)) with ECSTREAM
id B8/DE-10283-AFF5E5B4; Mon, 25 Jan 2010 19:22:34 -0800
X-Facebook: from zuckmail ([MjAyLjY5LjYyLjM3])
by www.facebook.com with HTTP (ZuckMail);

http://omniti.com/

Previously, i’ve heard of Port25′s powerMTA. (thanks to ashar bhai … our chief architect)
http://www.port25.com/