Yes, okay WIPTE is a mouthful, but if you're interested in tablet PCs and you're interested in instructional technologies, this looks like a good conference.
But this is the really cool thing about the conference, there's yet another university out there using tablet PCs, and GIS and GPS to teach with. Check out the abstract for "TEACHING SOIL – LANDSCAPE INTERACTIONS USING RUGGED TABLET PCs IN THE FIELD" from Darrell Schulze and colleagues from Purdue University.
A little searching on Purdue's web pages finds that Schulze has been working with tablet PCs and soil mapping already. Sing it Prof. Schulze, "Paper maps, however, have limitations, especially in the field." See some mapping-by-mini-van below.