Utah Code Camp will be held November 1, 2008 from 9am - 5pm with many varying presentations provided througout the day. The schedule and sessions are still being finalized, so you have to keep checking back regularly. http://utcodecamp.com/
Many of the presentations are about .NET, but there are quite a few about Ruby, Java, and other prevelant technologies.
Anyway, the reason I bring this is up is because there is a session being presented by a few Church employees about the FamilySearch API and consuming it with .NET. There's even a free library built specifically for integration with Visual Studio. Here is an abstract from the site:
Developing .NET applications for the FamilySearch Platform
Preview the new FamilySearch Web Services (API) and best practices for consuming them with C# and VB using a free library built specifically for Visual Studio. In addition to learning about the FamilySearch Technical Platform and Developing Network, this presentation will show how to easily create your own FamilySearch software application. We will demonstrate how to access and update FamilySearch data, how to explore your family tree, search a large database of genealogy records, and display and update information about your ancestors.
Speakers: Gordon Clarke and Jimmy Zimmerman