The carebear corp I am in was wardec'ed. One of the first things a corp should do when wardec'ed is to get a member list. Adding the members to your contact list means you can see who is online and who is not. Also allows the use of locator agents to find out where they are at any moment. In the past I would use battleclinic and look at kills/losses. This usually got most of the members but not quite all.
However last night I found this... http://evewho.com/