bloard - 3:09 am on Nov 9, 2012 (gmt 0)
The more I think about it, I think Lucy is pretty accurate... although the "not selected" number can decline. But at the same time my "not selected" number was rising, I was also working to clean up a bunch of bad URL's in the index. So as my indexed pages declined by design (through 301's 404's etc), I guess those moved to the "not selected" column causing an increase.
If this is the case, the term "not selected" is a poor choice of words, as it implies something of greater consequence. A little more transparency in this area would go a long way too.