script.aculo.us development setup changed to github and Lighthouse (May 9, 2008)
Source: script.aculo.us web 2.0 javascript (http://script.aculo.us/)
V1.7.1 beta 3: Prototype 1.5.1, more optimizations and fixes (May 25, 2007)
Source: script.aculo.us web 2.0 javascript (http://script.aculo.us/)