What. A. Waste. Of. Time.
Sometimes I just don't think. Somebody out there would probably have done this already, right? The answer to that question is yes. But it wasn't until I happened upon the hornget project that bells started ringing: "Hmmmm.... that's awfully similar to NuGet, isn't it?" Yes, it is.
Suffice to say that 10 minutes after this realisation I had FluentNHibernate running in my solution, with NHibernate 3 Beta and Castle Windsor 2.5.
So if you haven't already, go on and get NuGet.