Lora at whatisnew posted an updated list of case studies that describe uses of Tablet, touchscreen, and other mobile PCs in schools. This is a great resource for anyone preparing proposals and reports about their uses in education.
In addition to case studies, this and other sites report about the many educators and individuals who use mobile PCs, but have not yet appeared in third party sponsored case studies.
It looks like we have a large enough n for someone to conduct empirical experimental studies that provide evidence of the extent to which these PCs affect student learning rates. That would be a good research program for someone. Let me know if you're also interested. I am.
Hmm. I wonder who would fund such a study?