Not about investing in the slightest but *VERY* cool: The Interactive Scale of the Universe
This is by far one of the coolest things I have ever seen on the internet. I can't tell you how much I love it.
I stumbled across it here: http://blogs.discovermagazine.com/badastronomy/2010/01/29/the-interactive-scale-of-the-universe/
Here is the actual interactive scale: http://www.newgrounds.com/portal/view/525347