Having worked on this for a while, I’ve now released a set of simple, easy-to-use call handlers for Unity on NuGet. These include Method Logging, Timing, Caching and null argument Validators. I might add to this collection in future – the source code is on GitHub so you have a look through it as you want (or submit some more if you like :-)). If you use it in conjunction with the Unity Automapper, it allows you to very, very easily start getting a pluggable set of classes going with aspects.
You can get the package on NuGet and have a look at the docs on GitHub.
The Cockney Coder 