Sound I/O would be the mic and headphones. Last I checked the mic jack wasn't working yet. Headphone switching also doesn't work properly on the Wind (when you plug earphones or something into the jack it doesn't automatically switch to the earphones, so you'll need to switch it on a tray application). A small concession, sure, but I'd like to add that both work perfectly on the Dell Mini.
Right now the Samsung NC10 and HP Mini I believe has eclipsed the Wind's excellent keyboard, but if you're interested in running OSX, I wouldn't get any of them as random nerdlingers haven't figured out how to run OSX on both netbooks properly.
I would imagine that most, if not all netbooks can be placed on their side somewhat--I think the EEE 901s have this little knob on the side that would prevent that though. My Wind's sides are pretty flat so I can imagine just unfolding it halfway and letting it stand on its own.