I believe I am looking for the same thing Sunsi is..
I have added a few custom profile fields that are required at registration and I would like to add those to the email I receive when a new user registers..
I found a thread that appeared to contain what I needed, but the link (in post #4) is invalid:
https://vborg.vbsupport.ru/showthread.php?t=104814
--------------- Added [DATE]1240440836[/DATE] at [TIME]1240440836[/TIME] ---------------
After looking around, the new user registration email can be edited here:
Languages & Phrases > Phrase Manager > Product: vBulletin > Varname: $vbphrase[newuser]