The problem with model you point to is that its mains operated ... you'd need to plug it in to a nearby tree
But there are plenty of genuinely portable devices around - a new one from Epson looks very tasty. You need to decide which features are most important to you as they vary quite a bit in physical size, some offer screens for review of images - nice feature, but a hit on battery life. Some also double up as MP3 devices (or for that matter, some MP3 devices can be used for pics).
On cards - I've got Sandisk 256, Sandisk Ultra and Ultra II
. Disk write speeds do have a significant impact on "buffer restricted" cameras like the D60 and 10D - ie, you will notice the difference between slow and fast cards. But as you get to cameras with larger buffers (1Dii and 20D) this difference becomes less apparent - after all, it doesn't really matter how rapidly stuff gets transferred to the card provided you don't run out of room in the buffer.
Currently my largest card is 1mb (x2), but I'll probably buy one or two larger capacity cards in the near future, and keep the cost reasonable by avoiding the fastest types.
Colin K. Work, Pixstel