I generally bring my own card reader and thumb drive. I use the computer center to download my pics with the card reader, sort them quickly and then save the decent ones to the thumb drive. This system worked well on the Voyager last November. The card reader and thumb drives don't really take any room and it's more convenient than bringing my computer and CDs.
I have brought my computer along (generally because I need to do work!) so I can verify that Business class on Air Tahiti Nui does have power plugs - I used them last July on our trip.
Have a great trip.
Mary Ellen