CarTrackr on Windows Azure - Part 4 - Membership and authentication

This post is part 4 of my series on Windows Azure, in which I'll try to convert my ASP.NET MVC application into a cloud application. The current post is all about implementing authentication in CarTrackr. Other parts: Part 1 - Introduction, containg links to all other parts Part 2 - Cloud-enabling CarTrackr Part 3 - Data storage Part 4 - Membership and authentication (current part)