It looks like this might be the beginning of the end of Yahoo!'s Site Explorer. Using queries that typically redirect you to Site Explorer results are no longer redirecting to Site Explorer itself. In case you're wondering, as of today (11.11.11), you will now have to enter the Site Explorer address manually [siteexplorer.search.yahoo.com ]
I have a weird feeling we might be seeing the end of Yahoo!'s Site Explorer over the next few days or weeks.