At the moment, there are two online shops who officially sell the Raspi.
Farnell/Element 14 and RS were both overrun, and my latest state of affair is that you are only able to express your interest. Some people who were already able to send their order seem to experience waiting times from up to two months.
Partly this is a postivie thing, because it shows how successful die Raspi actually is. Nevertheless, I am tired of waiting, and it would be great if they addressed this issue and decrease waiting time.
On element 14 they offer the OS. I am downloading it and will report how it feels. Most people used any Linux distro to start programming apps to run on the Raspi, and mabye this is nearer to the "real experience.
You cannot install the original Raspi distro since it is a img file. Maybe there is a workaround....