I saw more laptops than iPads at BKK. I have a 17" Macbook Pro and yes, I carried it with me. It was a pain sometimes but I'm glad I had it with me. I did leave it in my backpack in the candidate lounge during signup, though.
Durianfan - you must have been the guy hunched over like Qasimodo! Seriously, my first laptop was a 17 inch. Second is 15 inch and I won't go back due to weight issues, unless they get an airbook 17" at crazy low weight...
I bring my iPad and my MacBook pro. I Leave the book in the hotel room and I take the iPad to interviews. One of the issues is that if you need to print anything the printers arent airprint capable. You may have to write or modify a document on the fly and print it out.