I get the vast majority of my computer-based entertainment via the Internet. Music and movies, and other forms of entertainment are easy to download from iTunes, Amazon, or anywhere. Though there are subscription services like NetFlix that are PC-only, that will likely change sooner rather than later. Occasionally, I'll buy a DVD, or a CD at a vintage store, and encoding those to MP3 and MP4 is trivial using a desktop system. I then get the benefit of being able to play them anywhere, instantly. I simply get more bang for my buck with digital files, and there's no reason I'll ever go back to physical media.
I also get the vast majority of my applications from the Internet. I can't ever recall loading a CD or DVD into a Mac to install software other than an OS installation. Even when devices come with driver disks on CD, I generally download them from the manufacturer's website since the version will be newer and hopefully better. The first disc I've put into my MacBook Pro in probably six months was the Apple disc that contained the MacBook Air's CD/DVD sharing installer. I won't miss it on the Air. With Bluetooth, I won't really need more than one USB port either. If I do, there are 3" x 1" four-port USB hubs on the market for less than $15.
So as I use the Air and think on this, I gaze around my lab, noting all the random cables, connectors, components, and options. There are several PC laptops around, rife with colored ports, switches, slots, and buttons. It's a stark contrast to the lithe little laptop in front of me. It's the antithesis, and I think that's a good thing.