I just did the same. Opened media-player to play a song, went to the browser to scroll around the fairly picture-heavy front pages of CNN.com and GameSpot.com. I flicked around with the stylus... all super-fast in my opinion and extremely usable.

Best online experience on a mobile device I've ever had. One can actually use these large sites on this device... on the iPod touch I'd get frustrated so fast.

Even the Flash ads on the way to GameSpot.com played well without any judder to Flash or music. I don't know if that is such a big bonus, though.

During the whole testing session the music skipped twice, very briefly, during loading and layout of the larger pages, when I was scrolling during layout/loading and otherwise abusing the browser by flicking madly around. Nothing to write home (or here) about, same I get under load at times on my MacBook Pro too. What is something to write home and here about is how well the browser handles large sites and how usable it is.

Really impressive stuff.