I've just seen this and I'm liking both the idea and the effects to the DT1 list.

Just one thought: since DT1 can change every month so can the DT2 list, so now it makes more sense for several DT1/DT2 members to tag scammers, just in case any tagger stops being DT2 for a few months (I know the idea is for everyone to customize their trust list, but most newbies will still rely on default trust).

And I want to insist on my suggestion regarding trust: guest should see some trust. Default trust would make sense but any trust. Non registered users are still being scammed by known scammers because they don't see the tags.