In terms of interests, Yahoo! notices that iPad users on its sites go for Flickr more than anything else, which they say lines up with the iPad as a content consumption device. The Finance, News, and Sports sites also got more traffic than the rest of the network (which, again, makes sense with a male 30-54 audience). And Yahoo! also finds that many iPad users also have iPhones -- nearly half of them had visited Yahoo! with an iPhone previously.
They're also finding that even though international users are getting the iPad late, a good portion of them didn't bother waiting -- 10% of traffic from the iPad audience comes from overseas. Interesting. Of course, this is only looking at those iPad users who have visited Yahoo! sites, and certainly these numbers are probably a little different from the iPad's audience in general. But as a pretty large cross-section, these numbers mostly match up to expectations.