Hi, Dwane,
There are three approaches that you can take. First is to use the existing membership capability within umbraco. Second is to wait for v3.1 and the membership provider stuff that John Cruz is working on...
"John Cruz has started implementing Membership Providers to allow for support of LDAP/AD, and your custom member DB for authentication. This should be released in v 3.1."
You can follow his progress and test early code at
http://www.codeplex.com/umbraco/The third option is to make your own. John H. and Jason J. have both made their own login routines against external databases. They have a nice discussion at
http://forum.umbraco.org/19747.
cheers,
doug.
MVP 2007-2009 - Official Umbraco Trainer for North America -
Percipient Studios