Since I travel 5 days a week, I do most of my editing on a laptop. Specifically, a new 15" MacBook Pro with Retina display. These laptops don't have a CD/DVD drive nor do they have ethernet or firewire. I bought a portable DVD/Blu-Ray burner that runs from one of the USB3 ports, then I hang my firewire terabyte miniature outboard drive through a firewire-thunderbolt adaptor. I also hang a 750 gig hybrid drive from the other USB3 port, so that gives me a total of 2TB (including the small but lightning fast inboard SSD) to store and edit from. Usually I'll park whatever project I'm working on onto my internal SSD, edit it there, then move the completed work off to one of my miniature outboard drives.
In fact, right now I'm typing this reply while online at 34,000 feet. Life is hectic but good.