indyank - 1:39 pm on Sep 13, 2012 (gmt 0)
I have never come across that so far and i do check all the supplementary index from time to time. I am not seeing it on my sites so far. I do block wp-admin with robots.txt in addition to restricting access to it to my ip alone.
But I do see some tag pages which I never link to on my sites in the supplementary index. These have noindex meta tag on them and are also blocked by robtos.txt. I am planning to remove the robots.txt blcok so their bots see the noindex meta tag.