Peter Kellner recently published parts 3 and 4 of his popular how-to series on building a custom remote security management application for ASP.NET 2.0's Membership and Roles feature. Part 3 covers Ajax enabling it with Atlas, and Part 4 covers adding personalization support with profiles. You can find the entire series on MSDN here:
For more ASP.NET 2.0 Security Resources, please also check out my ASP.NET 2.0 Security Resources Page.
Hope this helps,
Scott
P.S. IIS 7.0 includes built-in support within its GUI Admin tool for ASP.NET 2.0 Membership and Role Management -- making both local and remote management of sites super easy. It will work with any custom provider you've built (so it is not limited to only working with the built-in ones). It also does all of its remote management using HTTP based web-services -- which means it can work through firewalls as well as in shared hosting environments. I'll post some screen-shots of this in the near future showing it off (it is pretty darn cool).