I think perhaps the social bookmarks might have given you a little bit more importance.
Your robots is blocking the dynamic urls on your unsubscribe section and the site operator is "guesstimating" an unusually high number of pages in comparison to what you have...
http://www.seoworkers.com/mailing-li...subscribe&id=3
I would call this a
PR overflow "penalty"...
site:seoworkers.com - Google Search
Results
1 -
10 of about
143
( you have about 40 pages in the index )
I guess if page rank had anything to do with rankings you could have a problem on your hands.