Richard popped me an email about his latest “project” - a Silverlight implementation of Manic Miner which he has developer with Pete McGann. This is a very polished game but the cool bit is – they will be discussing how they developed it at NxtGenUG Coventry on August  11th 2008

Silverlight, XNA and Gaming
Matthew Smith did it in 6 weeks in the early 80's, now over 20 years later Pete McGann and Richard Costall have built Manic Miner in .NET, with an engine which works for Silverlight and also XNA. In this session Pete and Rich, talk about the .NET engine, implementations and issues on the two platforms - before Pete steps up to take the ultimate gaming challenge...
http://www.nxtgenug.net/ViewEvent.aspx?EventID=136