Word. You wonder how many of those 50,000 stars are just because they sell it so well. Brilliantly done and sexy as all get out. Bonus points for zooming in so the, ah, temporally disadvantaged among us can view parts of it easily too. The clear Try it and Docs buttons, then a big illustration and bullet list next to it, a brief getting started section, and examples... and testimonials! For a free product! That brings things to a whole new level.