Rumkin.com

Ciphers - Encode or decode secret messages in your browser. Great for geocaching, escape rooms, or simply passing the time.
Die Roll Stats - Useful to visualize the odds of many different types of dice producing results in a variety of combinations.
Phone Uploader - Send new ringtones, images, and Java midlets to your phone with ease. Works with many phones and providers, and I don't charge a cent!
Mailto Encoder - A safe way to put your email address on a web page and not have it harvested by spambots. Packed with features and ways to customize the encoding of the address.
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Atomic CSS - A new technique to working with CSS to make your maintenance life easier.
JavaScript Boilerplate - A useful wrapper and object definition pattern.
Palm OS Programming - Free programs, links to useful sites and other related gems.
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Web Experiments - Fun little things I tried out.
D&D Resources - House rules and software used by our D&D sessions.
Desiccant - Dry out an area using beads of silica gel. Great for buried containers, geocaches, and places where you don't want objects to rust.
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D&D Helper - Palm OS software to help speed up your Dungeons and Dragons campaign (or other type of dice-based system) by rolling dice, looking up information, and generating interesting things.
Java Puzzle Applet - Free puzzle applet that lets you easily add an image puzzle to your website. Very customizable.
Marco - A set of surveyor programs that run on Palm OS, intended to replace outdated hardware and bulky laptops in the field.
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See The List - There are a bunch of silly things that I encounter where there's no solution (yet) to be found on the internet.