[ShannonA]

Anyone have any hacks for federated logins across multiple vBulletin instances, multiple domain names, and possibly multiple machines?

There are a number of possible ways to implement this:

1. True federation, wherein multiple vBulletin instances use a single (possibly replicated) user database.

2. Automated, perhaps invisible, account creation when a user from site A accesses site B.

3. Guest privileges, where users from site A can post at site B as (user@site A). They might be integrated with openID or another standard.

4. Some sort of meta-userid which players can register all of the vBulletin logins with and then login to just than one metaid to get access to everything.

Options #1 and #2 seem the most desirable because they dramatically reduce the burden on users, but anything that makes it so a user doesn't have to memorize multiple logins and passwords is probably a good thing.