Rated 5 out of 5 stars
This is such a useful tool. Now that I have it, I find myself using it all the time. I used to try to sketch out similar-looking charts on paper whenever I found myself getting confused trying to form a mental map of a bit of source code. This is much more convenient -- and the color coding helps a lot, too.
A toolbar button would be a really nice addition to the next version. Alt-V-Shift-V is a little tricky to type, and context menus or anything involving right-clicks can be quite difficult for those of us with motor coordination issues.