If you wants charts for your #dartlang app, checkout the Charted package, used by the Ads team at Google.
I just sent in two pull requests to the Charted package. I must say that I had seen the package before, but at the same time missed it because the README did not catch my eyes enough to really download and try it out.
Talking to at the Dart Summit was a bit of an eye opener I must say. I downloaded the package today and it's very nice! It even provides a sleek demo so you can try out the different charts without even writing a single line of code. However, the README does not mention this, and the examples was in the web directory instead of the example dir. So that's what my 2 pull requests hope to fix.
Here is a link to the README with instructions (and screenshot) how to get started (note, for the current version of charted (before my pull request) skip "example" after pub run since they currently live in the web dir):