When reading through some now gadget reviews this little device jumped out at me. It is a mini hard drive based device that can copy files from several different types of memory card in the field and connecting directly to digital cameras and MP3 Players (and I would guess some USB memory sticks).
Battery life looks good with a claim of one charge allowing a 256MB memory card to be backed up 200 times. The device is less then 13cm wide and weighs in at 185g, but this strangely excludes the HDD weight.
You can also connect the device directly to your Windows, Mac OSX or Linux PC or laptop. More information can be found on the Sarotech web site.