Have you tried EASEL.LY ?

I just discovered easel.ly, an online infographic tool. Easel.ly could be used for posters, classroom projects and timelines. Please give it a try, I think you'll like it.   Beware, it doesn't work with Internet Explorer, so download Chrome and give it a try. 

Here is a sample I made and if you need to check out a book, it might help you :-)