I was in the grocery store last night cursing the paper shopping list I had written out. The list had grown messy from scratching out stuff I had already picked up, and items weren't organized in any fashion, resulting in my backtracking across the store three or four times. So I got thinking about how this is a perfect solution for a PDA. I want a PDA that:

• Can handle customized shopping lists, saving entered items for future use (perfect for groceries)
• Can organize said list into categories
• Has a user-friendly interface
• Is not an iPhone

Does anyone have any suggestions on what might fit the bill? I'm not terribly interested in using it to do any networking; I mainly want something that can handle data input and the like. Ideally, the device would be affordable, but I'm willing to explore most avenues. Any and all suggestions would be appreciated.