I am upgrading my site from the ASP.NET MVC Beta to the RC and I was running into a problem with some of my action links. The issue stems from an old version of the ASP.NET MVC Futures assembly (Microsoft.Web.MVC) that has some cool little niceties that I am using (like lambda's for ActionLinks). The old version of that assembly compiles with the RC but doesn't. If you're using both the MVC RC and ASP.NET MVC Futures, make sure you go get the update here:
http://www.codeplex.com/aspnet/Release/ProjectReleases.aspx?ReleaseId=22359
