I found this article really helpful when I realized all my work really revolved around my servers. I've got an iPad with a really nice Logitech Bluetooth keyboard and I love the fact that I can charge it overnight and use it all day (just like my cell phone). Of course, there are more limitations with my rig than you'd experience with a MacBook Air.
http://www.linuxjournal.com/content/swap-your-laptop-ipad-li...