If you've ever bought a planner, you know that the inexpensive ones often come with badly-designed pages and a bunch of things you don't need, and the ones you can customize tend to be on the pricey side; then it's easy to neglect to use them, because they're inconvenient to lug around. Some people use their PDAs or similar integrated cellphone functions in place of a big brick of paper, but many still prefer to keep track of contacts and appointments with a paper and pen.
In the last few years, there has been a trend in geekland: handmade planners tailored to their owners' needs. The simplest of these is the "Hipster PDA," a stack of index cards secured with a binder clip or elastic band, or kept in a small card carrier, popularized by Merlin Mann on his site 43 Folders. But if you want something more complex, or you would like formal templates for your cards, you should check out the DIY Planner.
The DIY Planner site offers free downloads of printable planner pages, templates for making your own, and a beginner's guide to help you get started. The pages come in various sizes, including 3"x5" and half-letter (the classic size for planners in the US), and you only need to use the ones that work for you. In some formats, there are well over 100 options. Be sure to visit the rest of the site, too: it's full of information about journaling and taking notes, and has an active forum.
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