I have an Air and its two USB ports are plenty for my purposes. I do have an external disc drive that I use to load CDs and to copy images or whatever for transferring data.

The one drawback that I'd see with image editing is the small screen. If you're doing fine postproduction work, I think a larger screen would be better just so you can see what you're doing and have all your Wacom tablet or Photoshop tools at hand.

Other than the limited screen space (which really isn't all that big an issue, to be honest), I love my Air. If I were dealing with discs and the external drive all the time, though, it might be a hassle.

Roxy