How about mentioning HP? They have the pocket media drives which actually dock into the newer HP desktops.
They are a bit more expensive, but the drive enclosures look very good, offer some additional shock protection, dock right into the HP case and work like a giant floppy drive. When you take it out of the dock, a USB connector in the back lets you hook up to laptops and other non-HP desktops. And a button on the front of the HP desktop can be used to perform one-button backups to the drive.
I'm no HP fanboy, but I've seen it work and it beats both DVD and tape drives.
And what about Freecom ? They have 2.5" external hard drives with INTEGRATED usb cable, so they're far more portable than the mentioned ones. They also can withstain fall from 2m thanks to rubber-like casing, and range from 80 to 320GB in capacity. They are extremely durable compared to these. I have two of them