I've been using Woopra, the real-time Web tracking and analysis application, with CodeHill for over a year now. The WordPress plugin they provide is working perfectly. However, their vBulletin plugin does not support the latest version, but you could add the following code snippet in the HMTL footer to enable tracking.
The if statement is to make sure I dont track the user with the user id 1. Line 4 and 5 use vBulletin's array $bbuserinfo to get the username and email. When using vBulletin's variables inclose them in a <phrase></phrase> tag so vBulletin would identify them.