Theres a lot of things to cover in that list ...

Here are the main category definitions as I can see them:

MP3 Player: A portable device for playing back MP3 audio files

Hand-held PC: A Handheld PC, or H/PC for short, is a Microsoft term for a computer built around a form factor which is smaller than any standard notebook PC or laptop (it is sometimes referred to as a Palmtop).

PDA: Personal Digital Assistant - any small digital device that can combine computing, networking, data storage and/or cell phone (and sometimes other uses too.). Originally just personal organizers, the lines have blurred a little bit with more technology whereby they have started including cell phone, camera, and other technologies.

SmartPhone: A smartphone combines the functionality of a Phone and PDA. Originally started as a phone, with the increase in technologies they have become much more than just that and now include cameras, data storage, email, messaging, and many other options.


Now, from the rest of your list, those are all brands or models -- i have put together a quick PDF sheet roughly outlining what each one seems to have (i don't have any of these, so I can't make a judgement on the usability etc.).

The sheet covers:
- A quick comparison chart outlining features, etc.
- An image and web links to each of the products you've listed, that way you can get an idea of the look and feel for the model.


I'd advise going to Best Buy, Circuit City, Future Shop, the mall (etc. etc.) to get a feel for these things -- pick them up, play with them. Decide what featuures you want, and what you can afford. Talk to people who have these devices, and see what they have to say about them. Use google to look at the forums for these devices, and see what problems / good points they have (its a pretty big expenditure of money, so you want to be sure what you're getting!)


Hopefully this is useful for you