"We launched a new look and feel for Site Explorer http://siteexplorer.search.yahoo.com/new) that provides a more dynamic interface to accommodate future feature roll-outs. The new interface also includes a new Site Summary page to provide statistics for authenticated sites. On top of this, we're also increasing the number of rules for Dynamic URL Rewriting that you can enter from 3 to 10".
Posted by Rene LeMerle at 12:54 PM GMT
Helpful blog. I use both. Obviously one is good for Google and the other for Yahoo so this really isn't a competition.