For reasons best known to themselves, Adobe do not ship the trial Data Visualisation components with the SDK download, so you have to extract them from the Windows download yourself.

First, install the Flex 3 SDK:

#sudo mkdir /opt/flex-sdk-3
#sudo chown myUser /opt/flex-sdk-3
#cd /opt/flex-sdk-3
#unzip ~/flex_sdk_3.zip

Then, use VMWare or something to install Flex Builder 3.

Now you need to copy the following files from (the default location under) c:\Program Files\Adobe\Flex Builder 3\sdks\3.0.0 into the corresponding location under the SDK root:

#cp datavisualization_3*.sw* /opt/flex-sdk-3/frameworks/rsls/
#cp datavisualization_rb.swc /opt/flex-sdk-3/frameworks/locale/en_US/
#cp datavisualization.swc /opt/flex-sdk-3/frameworks/libs/

Now you can use the new things like AdvancedDataGrid as well as the chart and other tools that were in Flex 2.