Well - you should take the note about CF card formatting very seriously! Because if the card is formatted differently in any way, you'll run into problems and it won't find the zImage and initrd.bin, even if they're in the main directory and have the correct names. I had formatted the card in the camera, but it didn't work. Only after reformatting on the Zaurus with FAT16 and copying the files (first zImage, then initrd.bin, then the terminal program just to be safe) did it work. Pretty finicky process, I would suggest always using an empty CF card for flashing and always formatting it. Better safe than sorry. And now I'm curious how OpenZaurus works.