After many years of hopeful expectation, IronPort (now part of Cisco) finally open sourced a bunch of stuff, most importantly Shrapnel, our proprietary version of stackless Python. Back when I worked at IronPort (2004-2006), I was dying for them to open source this stuff. The existing open source version of stackless Python at the time never had quite the same flavor or emphasis as Shrapnel, but these days gevent is very similar.
Anyway, congratulations to Sam Rushing, Mark Peek, etc., and thank you Cisco! By the way, there's a reference to me in the code ;)