From time to time, I feel inspired enough about something to write about it,
but don’t hold your breath.

Sprite Optimization

URL: http://mezzoblue.com/archives/2009/01/27/sprite_optim/

Admittedly, I've never worked on a website that required so much load optimization that all graphics & UI elements needed to be combined into a single image file. An interesting technique nonetheless.

Also read Website Optimization's for implementation methods.