2. Use Messenger Tools
With messenger tools, you can chat online with your friends, communicate with colleagues back in the office, and keep in touch with clients.
PDAs often contain more limited messenger tools than are available on the PC. Still, these are great tools for sending small amounts of text, conversation style, to friends and contacts while you are out and about because they offer the immediacy of direct communication.
Nearly all WiFi-enabled PDAs have the option of using one of the messenger options; see Handango for a list of many Messenger options, and also see the WebMessenger Messenger (supposedly cross-platform). Most PocketPCs already have MSN Messenger built into the operating system, and some have AOL messenger installed.