If you're in the ruby world, and specifically the web side of the ruby world (Rails, Sinatra, etc), you should probably know who Zed Shaw is. I mean, he only wrote mongrel, which you're probably using as your application server. Well, he's been hard at work on Mongrel2, and it's a big change from the original mongrel. Mongrel2 isn't a ruby web server. It's (and I'm going to borrow straight from the site): Mongrel2 is an application, language, an…