There is a relatively new site called Hardcaning.com.  I have not joined yet and have only looked at their preview pictures, but it is clear that these are very severe canings that are being administered.  These are truly the kind of cane marks that will last at least a month.  A caning in the diaper position is somewhat rare to see, but from what I can tell, every caning administered at Hardcaning.com ends with many strokes in the diaper position.  Hopefully the videos are as good as the preview pictures, I am now very curious.  Click any of the pictures for their full sized samples.

You can visit their site at Hardcaning.com