[Hovertruck]

We actually have our own in-house charting library at Chartbeat that uses Canvas that does exactly that (roll over the main chart):

http://chartbeat.com/publishing/demo/

[nicpottier]

Nice! FYI, those charts are VERY fuzzy on my retina display. :(

[Hovertruck]

Yeah. We're actually in the process of moving to D3 partly because of this. :\