The Canadian Heritage Institute has an interesting (slightly old 2004) article about PDAs in the museum environment
also see the links at the bottom of the article
This is a particular useful article on design process for PDAs
What are PDAs?
Web Delivery for PDAs
Repurposing Content for PDAs
Wireless Networks
SMS and MMS
Web Browsers for PDAs
Multimedia Content Delivery
PDAs and Museum & [...]
