Sample 11 is a submodule. After cloning the top level project, type:
git submodule init
git submodule update
This will fetch the indicated Hash-referenced-version source for the submodule Sample 11.
To checkout the subversion variant of Sample 11, type:
svn co http://ambientideas.unfuddle.com/svn/ambientideas_sample11-svnscm/trunk sample11-svnscm.svn
These samples were authored by Matthew McCullough of Ambient Ideas, LLC. If you have suggestions for improvements, fork the project on GitHub and issue a pull request. You can also email me at firstname.lastname@example.org