dc.js is one of those libraries that completely blows client's minds. The hard thing to do as a developer is not to try and filter the data too much. dc.js lets the end-user filter the data interactively and create their own stories, you just have to work out the questions each chart lets the user ask. http://dc-js.github.io/dc.js/

As it sits on top of crossfilter (http://square.github.io/crossfilter/) you can also do unusual things behind the scenes to the data sets. As an example, I used google maps to restrict datasets to the current map view. Worked surprisingly well. http://www.bathhacked.org/projects/hacked21-food-standards/

It looks like the link to the project on that article is down (http://www.sure-sense.com/fhrs/). Is it hosted elsewhere? I'd love to take a look.

Yeah sadly, it was a hackathon hack I repurposed afterwards for a startup I was working for. Will try and dig it out.

I really enjoyed using dc.js. It also rolls in crossfilter which is awesome for drilling down into data.

thanks for mentioning dc.js. I am looking for D3 wrappers which will make life a bit more simple. Care to mention more?

nvd3 (https://github.com/novus/nvd3) is also pretty good.

We've really enjoyed c3.js (http://c3js.org/). It has a wide offering of visualizations types and come with nice on-hover tooltips, which is something that I've had trouble finding anywhere else. Unfortunately it's difficult to customize their offerings, but they've covered 90% of our usecases.