Very small Linux PC - about the size of a small hardback book and genuinely portable, now in stock at PC world for £219 - if you have an external DVD-drive and a copy of XP you can install XP on it if you prefer.
These have been listed in a lot of the top 100 must have gifts for christmas and have been very difficult to find. Toys R Us have been the easiest place to get one so far (with all the online retailers generally sold out), but TRU have only had the white ones. The 4Gb ones in PC world are black (they've got the new 2Gb ones in white, but they're not such a good deal)
512 MB Internal Memory, 800 MHz Processor Speed ,225 mm Width ,160 mm Depth , 20 mm Height
It's gone up by 20 quid from last night (they were on for 199, cheapest I've seen them anywhere).