I have a medium-sized, public library that already has a wireless network installed and is looking to purchase either PDAs or Tablet PCs for use within the building to assist patrons. Not for the patrons themselves, but for the staff to use out in the stacks, etc.

Has your library been doing this long enough to provide feedback? I know the PDAs would be easier to carry around, but they'll also be harder to read, especially for web-based resources. What would you do differently with 20/20 hindsight? I've given them the link to Megan Fox's site, but they're also looking for current hardware recommendations, other best practices, and advice from the trenches. TIA!