Mootools :
This is just a bunch of links for personal reference.

v1.11 Official Docs

Mootools Support - The original Mootools forums are now ready only !

Great Mootools Reference !

Understanding the Mootools element selectors :

Mootools interpruts standard Javascript events

Plus additional custom events

Mootorials (Brillant Website !)
Miscallaneous :

Add reflections to images on a page using JS

Reflection -> Mootools Port

Lightbox -> Mootools Port

Rounded corners with jQuery

Nice Slide Script 

Mootools Slideshows :