Published articles
The following 2 articles by Jake Jacobs have been published in ZATZ magazines.

Using custom fields to assign multiple categories to Address Book entries
The Palm Address Book provides up to fifteen categories in which to place each entry. If you've ever found this limiting, Jake Jacobs has devised a clever solution. In this article, he'll show you a quick and easy way to use custom fields to help you sort through your ever-growing list of contacts. [PalmPower Magazine, September 2001]

Harness the power of databases on your Palm handheld
Databases are a commonly used tool in any enterprise. These powerful applications can be even more useful when mobilized on a Palm handheld. In this article, Jake Jacobs shows you how to create your own custom database using a general-purpose database program. He also presents some general features and techniques that can be used with any quality database program. [PalmPower Magazine Enterprise Edition, August 2001]