Damn, people are still commenting here and I forgot to mention the non-commercial stuff I'm doing. It all lives at http://greaterscope.net. I'm taking a stab at:

* Creating a foreign key based ORM for PHP5 * Creating a PHP5 database abstraction layer that's easier to use than PDO or the alternatives * An abstraction layer for html forms that generates, validates and even supports deeply nested "arrays of fields" * A console terminal multiplexer (GNU screen, but split-screen) in C for Linux

Disclaimer: There are existing projects similar to many of the above, but I'm striving to make my APIs cleaner, code readable and more concise. Plus I enjoy learning by doing.

I'm also extremely interested in wireless mesh ... anyone working on that?