Hmm, wondering why the av.rds.yahoo is in there on a ATW search?
I just checked AltaVista and it's not showing up there yet. Coming soon, though, I'd guess.
I wonder how long Yahoo will keep these sites open. In the short term they can keep getting whatever traffic the sites get from existing links and bookmarks. In the long term, though, I'd think it would hurt Yahoo's branding to have search engines with different names displaying the same results as its primary site.