I like to break things.. so here goes:

- I don't think you could ever stop one person from having multiple accounts.

- I still see groups of people elevating and destroying one person's trust rating without any appeal.
ie. A bunch of secret rascists who all have good ratings because they network, etc. can destroy a minority persons trust rating as soon as they move into the "wrong" neighbourhood.
ie. A member of a church comes out as gay, now everyone there demotes his trust rating.

Sure he can demote every individual that "has it out for him" but that's probably not as influential as 100 people demoting him. Correct ?

I like the idea, I just think you'll never avoid manipulation.. and if it becomes the defacto standard, people's lives could be ruined. ie. Job interviews, bank loans, potential relationships.