After releasing a preview of the ASP.NET MVC MonoDevelop addin, I decided to try it on the Mac.
Although the MonoDevelop 2.0 release on the Mac is still an alpha, it's a lot better on the Mac than 1.0 was. Other than a couple of GTK+ redraw issues, the major remaining problems are mostly to do with lack of Mac integration, such as Ctrl-Click, top-level menu bar and Mac-like keyboard shortcuts. Making MonoDevelop completely supported on the Mac is one of our targets for MonoDevelop 2.2.
I downloaded the Mono 2.4 Mac installer and MonoDevelop 2.0 Mac installer (beware, alpha release) then followed exactly the same steps from my earlier Linux-based walkthrough, and apart from a couple of harmless warnings during installation of the addin, it worked flawlessly!
Since none on the MD team is familiar with Macs, contributions from Mac users would be most welcome, including testing and feedback about how to make it feel more Mac-like.