The trend paves the way for the public launch of the organisation's self-regulation scheme on 12 February, when a £250,000 advertising campaign will be used to introduce the board and its logo (thirdsector.co.uk, 18 December).
Farm Africa, Sense and the Stroke Association were the first charities to display the tick logo on fundraising material.
WSPA is featuring the blue tick on the homepage of its UK website, and Harvest Help has become the first to display the logo on an annual report.
The international development charity features the scheme's logo and a statement saying that it is a member of the initiative, alongside its auditor's statement of confidence in its 2006 financial summary. This month it will distribute 8,000 copies of the document to new donors, existing supporters and trusts and foundations.
So far, 143 charities and fundraising organisations have become full members of the scheme, an increase of 24 since mid-November.
Kevin Lawrence, head of public fundraising at Harvest Help, said charities that publicise their commitment to self-regulation would build trust and confidence among new donors.
"This is familiar territory for the public," he said. "People look for external assurance in all kinds of services, so why not charities?
"We joined because the FSB fits in with our commitment to transparency and accountability. Anything we can do to encourage public confidence is positive."