I"ve never heard of anyone who doesn"t have access to a computer.
As the Foundation has stated in their introductions, its purpose is to make available very low-cost, credit card sized computers featuring modern low-power processing, HDTV graphics, networking, and USB expansion (any complete system, such as a laptop, at the same price point will be 10 year-old technology on the verge of failure). As you suggested, this would be a computer that can be dedicated to a student"s use so that there will be no risk of damaging software or hardware on a family or adult"s work computer. The Foundation volunteers and users are developing and organizing standard software and documentation on a wiki (http://elinux.org/RaspberryPiBoard) that will provide students and their teachers the resources needed to use and create software on the R-Pi. These efforts are also being coordinated with educator organizations such as Computing at School (http://www.computingatschool.org.uk) to ensure that the computers and software are effectively integrated into curricula at all levels.