I have been away for a week (just a quick look in, a couple of times during the week, even though I was supposed to be on "holiday") and while I was away Google got rid of the results that I previously referred to as BigDaddy A and B leaving only the experimental results, and the cleaned up version (with the oldest supplementals deleted) left behind, and the "cleaned up" version is the one that is on the vast majority of the datacentres now.
The "same snippet for every page" problem has also been fixed.
Sites that installed a 301 redirect before 2005 June no longer show the redirected URL in the SERPs.
Pages that went 404, and sites that went domain expired, before 2005 June no longer show up in the search results.
New Supplemental Results have appeared for any pages that have changed their status or their content at any time since 2005 June. For pages that are gone, the Supplemental Result has a cache of the final version that was online. For pages that have been updated, the Supplemental Result shows the previous content in the snippet, and the normal result shows current content in the snippet. In both cases the cache is usually only a few days or weeks old.
[edited by: Brett_Tabke at 1:36 pm (utc) on May 19, 2006]