One of the most interesting things I noticed at the RailsConf 2006 (held in late June in Chicago) was the Java-bashing (mostly tongue-in-cheek) that was going on.
This in itself was not unusual; the majority of the folks in attendance made the transition from J2EE to Rails.
What surprised me was there was no .Net bashing - .Net is not even a blip on their radar.
While this could mean many things, what it said to me was that in the bigger scheme of things the .Net school of web development is considered below the threshold of reasonability.
Even though many developers are building products using .Net, it is felt by the rest of the web-application development mainstream these are the unenlightened people that will learn the truth the hard way, when their customers or management start to question their productivity.