I'm impressed that some individuals seem to be able to adapt basic text files to suit their needs. If it works for them, that's great. I am much more comfortable using software specifically designed for the purpose. Can I keep my calendar in a text file? Sure. But it's so much easier for me just to keep it on a calendar. Although it's always possible that my favorite software will be discontinued, that risk is relatively small compared to the benefits I receive in the present. Plus, as others posted, the underlying workflow habits are the critical factor. If my software were discontinued, it wouldn't take me long to get up and running in another medium. I suppose the bottom line is that each individual should make an informed decision about what works for them. Paper or PDA, text or special software, it's all about implementing good workflow habits and getting things done.