authentication providers

[Bacchus D]

What are people's thoughts on auth providers we should be focusing on?
For release 0.1 we're delivering basic local password auth and OpenID.

Some obvious ones off the top of my head:

Google
Yahoo!
Facebook
MySpace (aren't they an OpenID provider?)
AIM
Hotmail (do people still use this?)

These clearly cover N. America and possibly the UK and other
Commonweath countries. What are the popular sites in South America and
EMEA that I might be missing?

[Bacchus D]

Something like this would be ideal.

http://popurls.net/user/

[Seymores]

popurls.net/user/ is very similar to http://stackoverflow.com/users/login.

There ought to be some kind of javascript for that little dialog for
OpenID selection.

[Bacchus D]

There's a Grails Facebook Connect plugin we should check out.

Also, Yahoo! BBAuth seems to be fairly straightforward:

http://developer.yahoo.com/java/howto-BBauthJava.html