I recently wrote an article on the use of Mono's CLI implementation in enterprise software integration products for .NET Magazine.  I got some great comments from Miguel de Icaza and OpenLink Software's CEO, Kingsley Idehen (he needs a blog!).  These guys really understand the value proposition of the CLI and the open standards process that Microsoft has endorsed.

For companies investing heavily in .NET Development that are supporting non-Windows platforms, they should really take a hard look at products from OpenLink, Tipic, and Winfessor to support their EAI efforts.