FF support should be straightforward.. just haven't had time to look
into it. Always open to patches :)
I tried it in IE8 using ExCanvas and it wasn't very smooth. I can see
3 options for IE support:
1. Don't do it (or at least wait for IE9 which has a good Canvas implementation)
2. Use ExCanvas, and accept that the charts aren't as smooth (jerky
charts may be better than no charts)
3. Investigate using another technology to render in IE (e.g. go
direct to VML, which is what ExCanvas does, but we'd get lower level
control).