2010-05-07: I’m thrilled to announce that we started development of polar charts today. It is closely related to the geometry of an angular gauge, so we can reuse much of the code. See live example at http://jsfiddle.net/highcharts/2Y5yF/. Please note that this is a work in progress, you will find bugs.

Today, 2012-03-27, I started implementing the gauge series type – which is quite quickly done, now that we have paved the way by refactoring Highcharts to a more modular architecture for version 3.0. You can follow the development at http://jsfiddle.net/highcharts/qPeFM/. Please note that this is a work in progress. You will find bugs.

For those of you who need some form of angular gauges and don’t want to bring in a second library, take a look at this mockup, quickly built on top of the Highcharts drawing API: http://jsfiddle.net/highcharts/bLks3/

While it is undocumented and probalbly needs some hacking to customize it, it could serve as a substitute until we are ready to launch a fully integrated version with intelligent axis handling, tooltips, animations and more of the Highcharts bells and whistles.

Heres how to use gradients to make the column chart look a bit like cylinders: http://jsfiddle.net/highcharts/2g78t/ . Also check out experimental radial gradients for pies: http://highcharts.uservoice.com/forums/55896-general/suggestions/888449-support-radial-gradients

A subset of Gantt features can be implemented in a line chart. See http://jsfiddle.net/highcharts/r6emu/ for an example.

We’ve created a small plugin for maps, as seen at http://www.highcharts.com/studies/world-map.htm. So far it supports the basic features of a Highcharts series, with point events, config options etc.

Here’s another example that has both clickable points with drilldown AND data from GS: http://www.highcharts.com/studies/us-map.htm

This applies to Android 2.x only. Highcharts already runs well on A3 and A4. We are working for a canvas renderer, which will be available for Highcharts 2.2.

This pluggable implementation was shared by Chris Stefano: https://github.com/virtualstaticvoid/highcharts_trendline

We added the new axis.showEmpty option. When you set this to false, empty axes are completely hidden: http://jsfiddle.net/highcharts/gdDbt/. This will be officially released in Highcharts 2.2.

This feature is planned for Highcharts 3.0. We wrote up a temporary hack, which is limited to SVG browsers. That means that it won’t work in IE6, 7 and 8. See http://jsfiddle.net/highcharts/PMyHQ/.

Although Highcharts doesn’t have a specific bubble chart series type yet, you can create a simplified bubble chart from a scatter plot with individual point sizes: http://highcharts.com/cases/bubble.htm

Check out this nice implementation by Stian Berger: http://jsfiddle.net/stiberger/UhMk4/