Those portable drives were pretty cool. I may get one in the future.
MrFurious--Since you need something to work on batteries, you may want to try this Sony Mini CDR burner on Amazon for ~$200. It is lightweight and can run on AC or 4 AA batteries with the external battery pack. The mini CDRs are only 200MB but they are really lightweight at least. Amazon also carries a 50 pack of 200MB mini CDRs for $26 that is listed in the similar items links. If you don't like it, you can always return it to Amazon no hassles.
http://www.amazon.com/exec/obidos/tg...01569?v=glance
I'm curious as well as how you are keeping your camera charged, does it also run on batteries as well? What kind is it?