MochiKit Documentation Index
http://mochikit.com/doc/html/MochiKit/index.html#version-history
"2008-10-21 v1.4 ... 2006-04-29 v1.3.1" Holy crap - that's quite a percolation time between versions of my first favorite JS library!
MochiKit A lightweight Javascript library
http://mochikit.com/ann/MochiKit-1.2.html
"MochiKit 1.2 is now available [download]."