I don't know how I missed this when it was released a few months ago, but this control is awesome - it generates very professional-looking charts that you used to have to pay hundreds of dollars for, and it looks just as good as the best charting tools I've seen.
The organization scheme seems a little convoluted to me, but it probably just seems that way because I was just trying to do a simple 3D bar chart, and the scheme is set up to allow a very high level of customization. I also ran into a few web.config-related snags while getting my code up and running, but nothing that I couldn't fix within a few minutes of searching the web.
Example screenshots and everything you need to get started are here.