Visual.ly looks like a promising tool
Mashable's 7/12/2011 report features Visual.ly - an upcoming new 'infographics' tool that enables users to find and make your own data-based infographics. Projected for full release in a few months, Visual.ly will have three primary parts:
1) a search engine for web-based infographics
2) a silo of data from government agencies, non-profits, and other data-focused organizations
3) a web-based platform for creating your own infographics - with no prior graphic design experience or software required.
Check out Visual.ly web site