Recently Miguel did a post that made me smile. He talked about several libraries from Microsoft which were released under an OSS license and thus incorporated into the Mono tree and ship as part of Mono 2.8. I smiled for two reasons. One, I was happy to see that Microsoft is becoming more and more open with our development platform. Second, I was happy because MEF was on that list. :-)
The full list is below:
I hope this is just the beginning!