"What concepts have you envisioned for dealing with griefers?"

Most of the ideas I've come up with involves tracing their IP addresses and then it sort of devolves from there into stuff involving rubber hoses, boiling oil and a bag of rabid ferrets.

Seriously though, the best thing any company can actually do about griefers is just have a no bullshit policy. Get the word spread that griefing gets you banned, period.

I play on an RP server in wow and I see a fairly large amount of griefing. It's been going on for years. If Blizzard was taking the reports of griefers seriously and actioning them with adequate punitive measures, this kind of stuff wouldn't still be happening.

Most griefers (in WoW at least) are quite aware that they have a ridiculously long rope before anything much happens to them. Until companies accept the fact that they need to lose the subscription fees of a few griefers for the good of the community, griefing will continue to be a problem.