Vanilla 1.1.9 is a product of Lussumo. More Information: Documentation, Community Support.
I jumped right into the pool with Scriptaculous. I know it probably isn't the best route to take. Documentation is a little more on the sparse side but what examples are available can be studied (view source). Prototype seems to be the standard from what I've gathered.
It's definitely a daunting task. There are so many different implementations and examples.
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