MochiKit is "feature complete" at 1.4 and not currently in active development. It has done what we've needed it to do for a number of years so we haven't bothered to make any major changes to it.
Contributions and improvements are welcome on GitHub!
MochiKit Intro Screencast
This screencast is an introduction to MochiKit 1.1, using the interactive interpreter example as a conduit for showing off concepts from each MochiKit module.
