I'd personally rather have an activity-logging plugin and rollback plugin, myself... Like, for example, the latest dev version of
LogBlock. It's like "Big Brother" was, but better, apparently. And it's actually still being updated despite the whole "
server monitor plugin merge" thing with Big Brother, LogBlock, and Hawkeye that was supposed to be happening
five months ago. The only downside is that it works on a MySQL database which, as a number of people know, isn't the most secure thing in the world. But so long as it's just
you that has access to the thing, I don't see a problem. (More information on LogBlock can be found
here.)
Another interesting plugin I found was
GreylistVote. Basically, it puts everyone on the white list into a "grey list", which means they can log in, but can't actually build. The people of the server can then vote people up or down to get them full white list access. The up-side of this is it means the players themselves can catch people in the act of griefing and penalize them for it. The down-swing is, of course, that it could be abused by people ganging up on people they don't like. But it's helpful.
Also,
CraftBukkit has been updated to 1.1-R1. Just tossing that out there.