Which Dependency Injection frameworks are compatible (and tested) against the Mono 2.4.2.3 runtime (Release Notes)?
Autofac most certainly is.
Worth noting that over 3 years down the line I'm yet to come across an IoC Container that doesn't work on Mono.
Note: Reflection based approaches to registration will not likely work on AOT compilation based platforms such as iOS via MonoTouch.
This SO question relates to using NHibernate with MONO 2.4:
ASP.NET MVC 1 and 2 on Mono 2.4 with Fluent NHibernate
I have used Unity with Mono 2.4.2 successfully before.
Hope this helps :)
Castle Windsor is.