In this thread you will find all of the downloadable sketch files for your personal use. Please note, as of January 2012 these files are no longer maintained by the Sketch Challenge Hostesses. They will be updated by a designated member at least twice a month. (Sketches from January to the present will be updated in the near future.)
You will find files in Word as well as PDF. There are options for color sketches, non-color sketches, and files containing both sketches and a card sample.
You can find links to each posted Sketch Challenge in the Master Thread
You can see all of the sketches at a glance in the SCSketches gallery