Yahoo now also offers some more information in their SiteExplorer software about owned websites as Google already does.
Playing a bit with the Yahoo! SiteExplorer showed a new nice button: MySites (archive.org)
Hmmm… sounds interesting, doesn’t it? So I just added one of my websites and what happened now? Verification file (ever heard that from Google, eh?!) - ok, installed. Now the verification process is pending, I’m waiting for the next steps and the information that might be available.