I'm working on something like that but it's very far from ready. I'm interested in any feedback...

http://frasergraham.github.com/live_stats.js/

Can it also be used with socket.io? I'm working on a real-time app and I'm using socket.io to transport the data and graphing it on canvas. I'd be happy to use a graphing library that 1) looks good, and 2) works with real-time data, instead of my custom solution.

I looked into it briefly, right now i'm more focused on getting the charts right. Once I've done that I was going to work on different data transport options.

Cubism is pretty easy to work with, or? See my heavily annotated sketch of continuous polling with Cubism; http://bl.ocks.org/2689616

Could be me, could be the docs, but I was having trouble groking how to wire up non-graphite/node.js connection.

d3 and cubism are great.

I have written another library, envision.js, which is more suitable for realtime data. Here's an example: http://humblesoftware.com/envision/demos/realtime. Envision here is adapted to Flotr2, but working with it is higher level than working with Flotr2 directly.