Yahoo doesn't have a cache date, so you could embed a date into the footer of your page to see in the cached copy.
Yahoo claims to index more pages than anyone, which would naturally make it take longer to re-index pages with the same bandwidth.
Personally, I don't think they index as much for some sites but more for others. They have different weights in place for crawling, which seems to make a lot of sense. E-Bay seems to get crawled a whole lot more in any engine than other sites, for example. Yahoo's weightings just seem to really favor those large, very frequently updated websites.
Brian.
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