sproutcore-plotkit-sample is a sample application meant to show off how nicely SproutCore and PlotKit can play together. 
 
If you're cloning this project from git, you must also clone the submodules with the following commands:
 
git submodule init
git submodule update
cd submodules/sproutcore-plotkit/
git submodule init
git submodule update
 
Also, if you don't have them, get the SproutCore build tools:
 
sudo gem install sproutcore
 
Now you can start the dev server by running "sc-server" in the sproutcore-plotkit-sample directory and hit http://localhost:4020/sc_plotkit_sample/ to see the app in action.