what i would suggest is bring a external hardisk(wallet size only). this could resolve bringing so many gadgets. but one draw back is that you need to find a computer to transfer your photos into it. i guess most places now should be easy to find a cyber cafe..
There are some external HDD enclosure out there that comes with card reader and battery, and you can just press a few button on it and it will backup all file from your card to the harddrive.
just google "hard drive with card reader" or something like this.
I know they are widely availiable in asia, and i seen it here in toronto canada too.
they are about 60-80USD for the enclosure alone, plus you need to add your own harddrive to it. which can comes in different price, depends on size.
or back in earlier days, i used to have a home FTP server setup, and i just find a computer and upload to myself.
but if you dont' want to go through these trouble, i say get a few extra card is the easiest way! and they takes up way less baggage space too.
last time I went to Asia, i was carrying 8G (two 2G and one 4G) cards with me.
Another smaller and lighter option would be the portable photo storage. There are several out in the market but we chose the Epson P-2000 after doing some research on it. What you need to do is slot your SD or CF card into the device - you can then view, delete, copy and store photos/videos.
It's rather pricey but worth the money as you get extremely high quality screen. We have the 40GB version but there is a 80 GB in the market now.
Here's the link for a further read.
I second this. I have an older Archos unit http://www.archos.comthat has 100GB hard drive in it. It is wonderful because the unit also does video playback and is a DVR that you can record from the TV just like a TiVo unit. Also does MP3s. The newer versions allow direct download from the camera via a usb cable so you can create folders and organize all the pictures. I convert as many DVD movies as I like so I have plenty to watch while travelling
Another safe bet is to bring your cards to an internet cafe or photo shop. For a few dollars they will burn them onto CDs for you so you can have a backup copy before you erase your memory cards.
Finally Nikon also makes a photo storage device similar to the Epson called the Coolwalker.
I have my own box for my photos. It's waterproof and safe from damages.
[ Edit: No promos thanks ]