aakk9999 - 6:22 pm on Oct 31, 2012 (gmt 0)
A "URL being indexed" purely means that the URL has been noted.
I would like to add .. and is available to show in SERPs.
URL not indexed will not be shown in SERPs
URL not crawled, but "noted" and indexed *may* show in SERPs
In almost all cases however, URLs blocked by robots are as good as "not indexed" (i.e. useless) when searching for keyword1 keyword2 or similar* (although backlinks may give Google some clue).
* Perhaps this is what g1smd meant in his middle post further above.