I'm not sure, is it list of escrow providers or campaign managers? Because as I know yahoo aren't providing escrow services, but he is very trusted, so he usually keep funds of campaigns that he manage. Meanwhile bl4nkcode don't manage campaigns, he is just providing escrow services.
Your list is very short so far, I'm missing lot of trusted escrow providers like Blazed, Minerjones, DarkStar_, OgNasty, Lauda and some others.
@Mitchell only listed BTC paid campaigns in his topic.
As I remember, Overview of Bitcoin paying campaigns was started when there was no altcoin paying campaigns. Some people have tried to make lists of bounty campaigns, but considering huge number of bounties it was way too much work to keep it updated. And offcourse, big number of these bounties were scams.