I just commited a new version of Flotr for Mootools. It is based on
Mootools version 1.2.3, with a few "More" additions.
All the features available with the PrototypeJS version have been
implemented, except a few bugs related to the mouse events, but I'll
fix them ASAP.
Please try it, and let me know if you find any bug !
http://phenxdesign.net/projects/flotr/examples/mootools/