[TYPO3-english] ldap auth / sso / single user database

[Antonio Willybiro]

Hi there,

I plan to design several community websites with typo3 + vbulletin on each 
(actually i already have enough website running to do that right now)
What i want is all the typo3 sites and vBulletin installs to use the same 
user database.

I was wondering what would be the best option to connect all this website 
together.
Please note that I cant  (dont want to) have them  on the same page tree.

I want to be able to properly manage/sync usergroups from both typo3 and vB 
and all user record fields (standard or extended i.e. from custom extension 
which extend fe_user)

There are several ldap extension on the TER and for vB i found that one: 
http://www.vbulletin.org/forum/showthread.php?t=196596&highlight=ldap
I was wondering if anyone had experience doing such thing and what extension 
you would recommend etc..?

Thanks
Antonio