I use USB for a USB keyboard (probably won't take to keep weight down), an XD flash card reader and a packet injecting usb wifi card. I couldn't get my Western Digital Passport USB powered hard drive working. That particular hard drive likes only a direct connection to a powered USB port for some reason. Tried attaching the drive to a full sized powered USB hubs and it didn't work. Others have gotten hard drives to work, but I'm opting for a solid state solution since I will be traveling and in some harsh conditions at times so solid state flash, though pricey makes some sense.

I am taking this camera with me: http://www.imaging-resource.com/PROD...W/OS770SWA.HTM

It's a waterproof to 10 meters, shock resistant point and shoot. The USB cable attaches and pictures can be downloaded to the N800 in host mode.

You probably won't need to take your MP3 player since the N800 has Canola. Also with MPlayer you can play a variety of video formats including .flv. With DVD Decrypter (decrypt to .ISO) and Fair Use you can rip your DVD collection down to 320x240 format, around 180 meg depending on the movie. Fair Use is good because you can defer processing and do batch processing of several movies. I ripped my anime collection and it allows batch processing of episodes. I converted about 200 movies to DIVX avi. Not totally crisp, some pixelation but pretty good. It depends if you have a hard drive which is self powered that works in USB host mode. Since I'm using flash card as medium, I'm sacrificing some quality for smaller files.

Highly recommending lightening your load as much as possible. Schlepping heavy stuff gets to be a drag.