Handhelds in the Classroom…Action Research Project

I'm going to leading a project on using HandHelds in the classroom. It's a project grant I helped a grade 8 teacher apply for almost a year ago. It was just approved last week. The project is going to be highly experimental and certainly based on the action research model. We'll be relying on the work of various educators and case studies that will guide the project. It's likely that we will not have internet access with the handhelds. I'm wondering about the power of these tools without having access to the internet, especially in the light of this article via Mark Wagner. I watched this video and see other classrooms using it without access. 

How valuable a tool will these handhelds be without internet access? What advice would you have regarding this project?