The Tech Zone has published a guide to help give you an idea what to look for in PDAs.  With the vast amount of choices on the market, it really comes down to what you need, and they are happy to tell you the key features to search for.
“The Personal Data Assistant (PDA) has won rapid acceptance among university students and executives who are constantly on the move because of its ability to package a lot of different data requirements into a palm sized device. The PDA is designed to make a busy life easier by providing sensible connections to all the information you need, have it at your fingertips when you need it, and transport it to other systems. Once ‘organized’ with your PDA, you will have all of your contact phone numbers, be collecting your emails, process your business orders, display your photographs and relax to your MP3 library. Many PDAs also act as a digital recorder and have windows based compatibility for word processing and spreadsheet financial calculations.”

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