"Bachman Software"
http://www.bachmannsoftware.com
Find answers to your PDA printing questions here! Bachmann Software sells PrintBoy, an application that allows printing directly from the PDA to an infrared printer, and sells infraready adapters to convert standard printers. They will work with schools to negotiate reduced cost for the software, contact them via email from the site.

"Taking a Closer Look at Ubiquitous Technology in Education"
http://probesight.concord.org/
This site is split into 5 arenas: 1-What are They? 2-What's New 3-Curriculum Ideas 4-Supplier Index 5-Collaboration HQ
The Curriculum link has a lot of info on handheld use with sensors, and even offers sample sensor activities.