There has been some really good discussions going on in the blog world about the Rails vs. .NET debate (MonoRail in particular), if you want to call it that.
I posted recently here about the subject from reasoning in my own mind and to foster the discussion on my blog.
Scott Bellware has had a series of blog posts on the subject and today posted with his comments about recent comments. I think the debate is very healthy and shows the passion from both sides. What is particularly interesting to me is Scott is a Microsoft MVP, so he has an investment in Microsoft technologies but is very passionate about Ruby and Rails.
Scott has a previous post talking about MonoRail vs. Rails which is also worth the time to read.
The comments posted are also worth reading, all very good.