I just confirmed that when I am over in L’viv Ukraine working with our team there (btw, they are a kick @ss team) I will be speaking at the L’viv .Net Users group.  The topic of the night will be MEF (on codeplex). 

The Managed Extensibility Framework (MEF) is a new library in .NET that enables greater reuse of applications and components. Using MEF, .NET applications can make the shift from being statically compiled to dynamically composed. If you are building extensible applications, extensible frameworks and application extensions, then MEF is for you.

If you are in the area and are up for an English based session on MEF please stop by and say hello.

For more information check out http://dotnetug-lviv.blogspot.com/