There aren't any out yet. The best apps for the iPad are likely to be quite different than the best iPhone/touch apps. The iPad is better at different things, and will be used in different situations.
The app store has a fairly decent way of rating apps you might find interesting. A couple tips: Try googling "favorite iPad app" a couple months after release. Also, if you have any hobbies or interests, enter them in the app store search bar... and keep looking. Chances are someone is working on something.
All that said, I'm waiting for that giant game of Doodlejump.... doiiiing.... doiiiing.... doiiiing....