There's an exciting, new conference going on the .NET platform for those really interested in languages and compilers: Lang .NET 2006. Unfortunately, the website doesn't have a lot of info up there yet. However, Erik Meijer, the program chair for the conference, has posted a bit more information here.
Did you notice that I'm on the committee? Yes, as if I wasn't busy enough, I've jumped into the fray to help with this gathering. Truth be told, there isn't that much work other than working with the others on the topics and paper reviews - the Microsoft guys have to handle all the logistics. But I'm really looking forward to this.
My guess is that, since this is the first one, it's going to be finding it's legs this year, but the goal is for this to be a recurring event. I'll keep you informed as we get it rolling - it's a bit more acedemic than most of my readers are probably interested in, but hopefully you'll find it interesting.