When you start your server each plugin will load and usually provide a version number in the console.
I'm looking for a command the requires all plug-ins to report their version numbers. I dont go into the console or remote into the server much and would love for admins to be able to gather some simple data about the server when there are suspicious problems. I or an admin could be able to type /version and it lists off all the plugins and their version. If this doesnt exist, I'll probably post a request to the bukkit team.