Since you mentioned this, I just started working with IronRuby and are robbing the current project. Since I do not need my team to install MRI, I decided to go with the xcopy deployment of IronRuby, which I preloaded using the rake. Not sure if this is exactly what you need, but check out my blog post on early results.
http://dylandoesdigits.blogspot.com/2009/11/rake-for-net-projects.html
I think this meets your requirements..NET based on dynamic language execution, without XML. As the current copied angle bracket, msbuild, I am very pleased with how little work there has been so far.
Dylan
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