Hmm, well, I just saw this in your response to Ysabet...

"Saturations do not count toward your completed color list totals, and likewise, you do not need an open list slot to complete a Saturation."

Not that it made any difference to me (I have four active color lists now, and that's the most I've ever had at one time!) but I had no idea this was the case. So maybe that information should be somewhere other than in a comment response!