"fund raising standards board" FRSB tick credibility logo competitor, but free with no fee ;o). A service to put the minds at ease of potential donors. How good? Dunno, got here from Thirdsector Mag.
Putting science of influence to work in fundraising: The Power of Persuasion - Standford Social Innovation (free PDF). This is based on the psychological principles found in the authors book! - by the same title
The mebership is on a sliding scale, and you get benefits too. If you are running your org or are a senior member, there is even potential to get train to gain grants to pay for some of the training!