[peter_d_sherman]

Making your code so simple (and well documented!) that it can be understood by programmers with much less experience than you, while not compromising speed or functionality.

“Everything should be made as simple as possible, but no simpler.”

-Albert Einstein

[karmakaze]

This is the one I strive for. Making a challenging thing self-evident and appear like it wasn't that much work, even when it was an explosion of code later distilled.