After getting Authentication to work I noticed a couple of other things.
1) I can't log in as Admin when I have the authentication bit set for the forums.
2) I'm getting an error when I go to log in from one of my accounts:
Cannot insert duplicate key row in object 'tblAuthor' with unique index 'Username'.
3) We would want to use our NT groups on the forum, for instance, I'm in the "Technical Managment" group. We should be able to set permissionson a web forum for "Technical management" as a group.
Anyone in that NT group would be able to see things in that forum. Still need the Author as separate.
Also, on a related note, not being able to put users into more than one group really makes groups not so useful for us.
Product looks great. If you can thoroughly integrate Windows Auth and Active directory groups, ect. you will have a real killer product.