Hello, Eric Butler (http://www.twitter.com/codebutler), who is the main author of the MonoDevelop addin for Monobjc, has made an unofficial installer package for Monobjc. It can be found at: http://codebutler.github.com/monodevelop-monobjc/
Feel free to try it and report some feedback. Regards, Laurent Etiemble.
