[Rexxar]

Interestingly, there's only one big image per agent :

-> http://clippy.js.s3.amazonaws.com/Agents/Clippy/map.png

-> http://clippy.js.s3.amazonaws.com/Agents/Links/map.png

-> http://clippy.js.s3.amazonaws.com/Agents/Merlin/map.png

-> http://clippy.js.s3.amazonaws.com/Agents/Rover/map.png

[jwatzman]

Spriting is very common. For example, here's how the Facebook logo on the homepage is rendered: https://s-static.ak.fbcdn.net/rsrc.php/v1/yO/r/_2cdInypv2b.p...

[skeletonjelly]

Makes sense I guess. Interesting that it's not a gif you mean? Using sprites means it has nothing else to load when changing animations, saves that jarring load.

[idleloops]

Fascinating. I assumed they were animated gifs.