It's a computer that's as small as an ethernet socket. It's got an ARM7 processor. It's also all over the Internet already, but there's probably at least one or two of you out there that hasn't seen it. It'll cost you a mere $130-ish, which is not many pounds due to the good exchange rate these days (eh, Paul?). Sadly it runs Linux, but hey, ARM processor! Now, if only I could get a web server running on it... and about 2,000 times the storage (some sites say 8MB max flash memory, although some say 4MB).
Links: Picotux