Lang.NET
Thottam has a good overview of the 3 day event, as does DevHawk and OakLeaf. F# in action. SecondLife (Mono) was one of the topics discussed, but I still can’t find the slides on the web 😦 – I believe RAIL is used as part of the implementation. Christopher’s CAT slides can be found here. Classbox is explained a little here together with a question on C# 4.0. Gray Flake slides are available here on Internet Singularity.
Tales from a Trading Desk 
We are working on the slides from the presentations and will have it published soon. I saw them in an internal site recently and hope to them on the internet soon.
http://blogs.msdn.com/thottams/archive/2006/09/15/756321.aspx has the videos from the symposium