I followed the directions in the Membership Providers document provided by Sitecore, but I was unable to get my membership provider to work correctly.
Specifically, in the web.config, I changed the "realProviderName" attribute on the sitecore provider to point to my provider. However, this didn't do anything.
I realized that the "defaultProvider" attribute was set to the "switcher" provider, so I changed that to point directly at my provider, and it worked, but I'm not sure if I'm causing problems elsewhere by doing this...
Has anyone done this before?