This is all part of a spreadsheet I've been using to visualise how the final poster-sized image will work out. So far I've completed two columns and almost one entire row! Please bear in mind that these little people take about 2 hours each to create.
On a similar note, here's an awesome piece of art along the same vein as Heroes of Science. This one's entitled "Champions of Reason", and is by graphic designer and comic artist Saejin Oh:
You can view the full-sized image over at Art of Jin, and you can even download a humungous PSD version of the image, should you wish to non-profitly print one and hang it on your wall.