Here is a post on Fresh New Illustrator Tutorials From 2016 gives you an idea of latest trends in illustrator software.
Google Image Result for http://www.lightmix.com/blog/wp-content/uploads/2009/08/ScreenHunter_08-Aug.-04-03.47.gif
An interesting discussion about radial graphs
A new design for a radar chart in D3.js. You can read more about in on the blog I wrote "A different look for the D3 radar chart"
data visualization radar
radar chart - think spider!
Visual infographic (morphing) "was used for online-empires-rise-and-fall"
Radial Charts - Interesting article on why they are beautiful, but perhaps not best at representing data.