"Introduction to music theory: an outline of basic music theory.
This outline offers a concise and complete overview of basic music theory."
(concise and complete is right! wow!)

DDMM is a program for people who use 2 or 3 displays. It prevents the mouse from crossing from one display to another too easily, and allows teleporting mouse pointer between displays with a hotkey.

Visualize regular expressions. Very useful.

Realtime domain availability search

SQL queries can be returned as XML - this article describes some of the formatting options. Of special interest is the use of XPath to control the structure of the XML.

Build a sublease agreement with the details you want, with binding contract as the output.