Ads on iPad Perform Six Times Better Than on Desktop
A recent study of rich media ads from textPlus, pointRoll and AdMarvel found, in the first four weeks of the iPad's release, ad interaction times were 30 seconds, ad interaction rates range from .9 to 1/5% (6X higher than desktop ads) and 67% of users who viewed the ads' video component watch all the way though as compared to 53% for the desktop.
Granted, some of this is likely due to novelty but if these numbers hold, there will be some willing iPad advertisers out there.