Do you know what I find a greatest addition to C# 4.0 / .NET 4.0? Dynamic? Well, it really did enable some interesting options (especially for F# and MVC), but it wasn’t a gamechanger really Covariance and Contravariance? Seriously, do you feel the difference? WF 4.0? Ok, it was a big overhaul, but it still lacks some “feature identity” - noone uses that as it’s hard to identify any scenario it’s really helpful (and / or necessary) with MEF? Oh yeah, that’s some quality - but there are some other IoC containers (yes, I…