<p>I'm looking at using OpenID for my authentication scheme and wanted to know what the best .NET library is to use for MVC specific applications?</p>

<p>thx</p>

.Net OpenID project
is the best library to use right now that I know of.  I think SO used it also.  The source includes a sample ASP.NET MVC project using the library.
Scott Hanselman did a
post
on how to use the .Net OpenID project inside of ASP.NET MVC.