Thomas Fuchs is the pioneer of the first FX JavaScript library script.aculo.us and as he and his work reside in Vienna (which is more or less my hometown) I have to support his new open source product called scripty2 which is a successor of script.aculo.us.
To keep things short: It’s a first release and therefore still in Alpha. It looks promising, especially because it’s only 5KB of size (gzipped & excl. PrototypeJS).
Check out the demos to see if it’s something you gonna need for your future work or not.