Although I had registered an interest at the Raspberry Pi site, on the launch morning they swapped to using RSWWW and Farnell components as resellers.
I was driving at the time so I was too late to place an order and since then I've only been able to 'register an interest' at the RSWWW site (and I've not received any email confirmation that my interest really has been registered).
But this morning, I found this link at Farnell that actually let me place an order. I don't know if it will work for people outside the UK, but it's probably worth trying if you've not ordered already:
http://uk.farnell.com/jsp/search/pro...sp?SKU=2081185
I don't know when the thing might actually arrive as all stock is sold out, but now I at least feel as though I'm in a queue.