Many people have emailed me asking about the TSF samples on MSDN. They’re supposed to be on MSDN code gallery, although they don’t appear to be there.
They are, however, part of the Windows SDK. After installation, you'll find them in %programfiles%\Microsoft SDKs\Windows\v6.1\Samples\winui\Input\tsf.
There are actually more samples in the Windows SDK than were on MSDN, including some examples of how to write a text store, as well as how to interact with TSF in UILess mode.