The standard list of UserAgents in Vbulletin is quite limited, but you can add to it easily. This list is fantastic:
Index of /spiderlist
Index of /spiderlist
I saw that plugin alright, but I was more interested in tracking them when I'm around
I've also added them to the activity section in the site footer
Go to the main page and have a look at the bottom of the page. You will see who is online. Instead of simply marking the bots as "guests" it tells you which spiders are currently onlinei don't quite understand what you mean here