On the Microsoft stack side, everyone knows about Visual Studio. The licensing cost for the Team Suite is $10,939. LAMP developers just love to point that kind of thing out. But folks, the fact is, that price is not measurable as the equivalent of LAMP freeware. It’s for an enterprise shop that needs very advanced and sophisticated tools for performing every corporate software role in a software development lifecycle…
Not to mention the subtle insinuation that the open source "freeware" is just a toy and everyone knows you have to pay for the real stuff. I cannot imagine how Microsoft developers begin a project. "Today, I'm going to write this new web app to change the world! Right after I spend the day setting up Microsoft Team Studio and purchasing software licenses for every computer I plan to use!" How inspiring.
As in "Today I'm going to write this new web app, as soon as I install Eclipse, Django and SVN" would sound just as silly. It's just development tools.
Oh, and for what it's worth, Microsoft will give you 15 seats worth of MSDN Universal for $400 if you tell them you're a small business. Per seat, the MS tools are the cheapest part of setting up a new dev box for me. (CodeSmith, ReSharper and Ants Profiler are the ones that hurt!)