As the Adobe doc's are a bit thin on the ground here, this is how to install the optional Charting stuff into a local install of the Flex 2 SDK.
- Download and unzip the Charting stuff from http://www.adobe.com/cfusion/tdrc/index.cfm?product=flex. You want the 16 meg 'Windows' one. Ignore that :-)
- Run the installer from the command line and answer the question (where is the SDK) when it asks you: java -jar /tmp/Flex\ Charting/flex_charting_2_installer.jar
- ...
- Profit !