I finally made it :-) Here are the files with slides and sample code for the sessions Ian and I did at DDD 5.

Bluffers' guide to C# 3.0

10 cool things to do with C# 3.0 - Ian's stuff

10 cool things to do with C# 3.0 - Oliver's stuff

Finally, the sample from my session .NET 3 - The Game Challenge can be found here, attached to my previous blog post.