Cacher is the code snippet organizer for pro developers

http://qnimate.com/lazy-loading-images-and-its-seo-impact/
https://github.com/easy-designs/easy-lazy-images.js
https://github.com/qnimate/Qazy
http://www.appelsiini.net/projects/lazyload
http://luis-almeida.github.io/unveil/
http://www.createjs.com/#!/PreloadJS
http://imagesloaded.desandro.com/