There was a discussion about the Swiffer covers on the Craftster website: www.craftster.org
There are several knitting threads there. If you haven't looked at the site before, you might want to check it out. Some of the stuff is pretty funny, many of the patterns (both knitting and non-knitting) are stunning, and the site has a different attitude.
One of my favorite threads there is Stitch and BOTCH
. It talks about craft-related accidents and other mishaps. You can't go wrong with topics like "I killed my sewing machine".