Having a PDA, or utilizing additional technology, won't automatically make you more efficient. It might take you a long time to get used to utilizing it to help you manage your time. And then you'll have to make a habit of utilizing it. It may work as well as any paper-based scheme, if you take the time to learn how to utilize it correctly, and it has the benefits of compactness, the power to search for words and phrases, the power to store crucial documents, and so on. However, without acquiring the right habits in utilizing it, it may as well be a brick. Lastly, you might discover that the correct system for you is a hybrid one: maybe you use your PDA for Appointment and Contact management and a paper planner for jobs and projects ... My goal herein isn't to sell you on having a PDA but to show what you are able to do with one, so you are able to try it out and see if it's good for you.