I've been having problems with SD cards. You can see one problem on the startup screen above: "Kernel panic - not syncing:" This is with the 4GB TDK card I mentioned above.
I swapped to using a 2GB micro SD card in an adapter. That displays lots of errors on the startup screen, but works reliably, albeit slowly, once the system has finished booting.
I read on the various forums that this is a known problem, but I've not found any definitiive advice like 'buy card X and it will be okay' - it seems that there are many fake SD cards out there anyway. Some of the reports of working cards may actually be fake cards but how can you be sure that you'll buy the correct brand of fake? I shall buy a few cheap 4GB SD cards from various sources over the next few days and hope that at least one of them works well (and fast) with the Pi.
