Last month I bought a Nokia N810. At first, I debated getting an Apple iPod Touch. To be honest, if the local retailer would have had some 16gb versions in stock, I would have probably went ahead and purchased one there. After going over what I wanted out of that type of device, I decided on the N810. For most other people I would suggest the iPod Touch or an iPhone.
There are a lot of people looking for iPhone's and iPod Touches on the net. Everyone wants a good deal on them. The deals aren't hard to find, you just have to know where to look. For instance, these are about the best one can find (clicking the links will take you to a site full of iPhones of all types):
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There are many imitation iPhones as well. The BlackBerry Storm is one of them. Blackberries are much more popular with the business crowd, or at least have been in the past due to the full QWERTY keyboards. They have also been integrated into the business environment much better. A company I used to work for used Blackberries along with their Lotus/Domino servers for mail, calendar, and other databases. This allowed people on the go to access all their appointments and contacts from anywhere. Unfortunately, the Blackberry Storm hasn't recieved the best reviews, and it doesn't have the features that business users looked for and received in the past with a Blackberry.