Mono Is Cool In Concept

I've been working a bit with Gentoo Linux lately and I was curious about cross platform development between WinBlows and Linux (Yeah, I know, gross!). The one project I came up with that seemed plausible was Mono. Mono is a cross-platform development environment that uses basically replaces .Net. It has the C# language (the flagship of .NET development) and it seems relatively complete. The only problem I see so far is a problem that affects many open and closed source projects ... the documentation sucks. I am looking to compile a set of C# code into a dll and it is next to impossible to figure out how. I'm probably missing something. I'll report what I find out in the next few days on the blog.