CLR Add-In model in .NET 3.5
While doing some spelunking to support application extensibility I ran across a new feature that is being worked on for .NET 3.5, the CLR Add-In model. You can check out the CLR Add-In Team Blog. They also have 2 articles up on MSDN Magazine, Part 1 & Part 2.
The ability to create an application that allows for plug-ins, add-ons, etc. seems to be a relatively frequent request. It has been pretty darn hard and most of the time projects I've worked on (usually customer's internal business applications) punt on the issue.
Looking forward to seeing how this develops...