Google Supplemental Index is History
OK, so this post is about 2 weeks late but I get this question enough to go ahead and post it now: Google has officially removed the line between "regular" results and the dreaded supplemental index. See this post on the Google Webmaster Blog where they say:
"...Now we're coming to the next major milestone in the elimination of the artificial difference between indices: rather than searching some part of our index in more depth for obscure queries, we're now searching the whole index for every query."
"People hated the supplemental index so we 86ed it."