Here is the latest in my link-listing series. Also check out my ASP.NET Tips, Tricks and Tutorials page and Silverlight Tutorials page for links to popular articles I've done myself in the past.
ASP.NET MVC: Membership Starter Kit: Troy Goode has a built an awesome membership starter kit for ASP.NET MVC that provides registration and login pages for users to authenticate on your site, as well as a set of administration functionality that allows admins to create/manage users and roles. Download it here.
Hope this helps,