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Also to note the new search page layout: [search.yahoo.com...] - again, CSS positioning rather than tables, and it looks like the google.com home page to the extent that it's virtually a carbon copy.
Yahoo is going standards-compliant - we'd seen the first hints of this in Yahoo Mail, Calendar, Notepad etc. but the home page and search page are much more significant. Note to standards advocates - neither page validates, mostly due to the usual unquoted attribute values, unescaped ampersands and a broken doctype on the search page. Nevertheless, this is a very important step forward.