In my experience, I’ve found that Palms are somewhat less powerful than Pocket PCs, but reliable. Pocket PCs are quite powerful, but more likely to act up.
PalmOne (the hardware company) has three product lines: Zire, Tungsten, and Treo. Zire is their consumer line, Tungsten is the more expensive line targeted toward professional users, and Treos are high-priced Palm-based cell phones.
Pocket PCs are made by a number of companies, with many product lines, but the thing they have in common is they run Windows Mobile.
All PDAs provide the basic organizer functions, so you’ll want to base your final decision on what extras you want, like color screens, larger screens, expansion options, integrated wireless hardware, and multimedia capabilities.
Also, you should consider how you’ll interact with the device. Palm OS doesn’t have a desktop counterpart, as it was designed from the start as a PDA OS. Pocket PCs use a derivative of Windows. Palms, out of the box, exclusively use Graffiti for pen input, while Pocket PCs have the option of handwriting recognition. Some models of Palm and Pocket PC have little keyboards built-in, too. I recommend you go to a local computer store and try some Palms and some Pocket PCs, and take note of aspects you prefer.
Wireless Internet access is a huge topic and can be quite complex, so I won’t go in depth to avoid hijacking the thread. You’ll probably run into three main types of wireless communication, Bluetooth, Wifi, and cellular. Bluetooth is short range, mostly a cable replacement, and can be used to communicate with a cell phone. WiFi is usually the most familiar with users, and generally provides fast network access on a room or building size scale, and “hotspots” can be found in many cities and especially on college campuses. Cellular access is expensive, but provides coverage wherever you get a cell phone signal. If you want more info, drop me an e-mail. My address is in my profile. And yes, with the appropriate equipment one really can access the Internet from just about anywhere.
Hardware-wise, Palms are somewhat lacking in the mobile Internet department. Almost all Pocket PCs have either built-in WiFi hardware or the option to use an expansion card. Only the Tungsten C line of Palm handhelds has built-in WiFi, and it wasn’t until recent that a Palm-compatible WiFi expansion option became available, and it only works on a few models.
A Blackberry is basically a handheld Internet device combined with a cell phone. They are rather expensive, and generally used in corporate environments where the buisness pays for them and provides some of the infrastructure needed to fully take advantage of them.