It's very easy to use, blazing fast, cross-browser, standards compliant, provides controls to modify any CSS property of any HTML element, including colors, with builtin checks that won't let a user break the effect with multiple, crazy clicks. Optimized to make you write the lesser code possible, the new moo.fx is so modular you can create any kind of effect with it.
What’s new: moo.fx2 Introduces a lot of new stuff: beginning with Fx.Style, to modify any chosen CSS property, then Fx.Styles, to modify any number of CSS properties at once. Those two are the most powerful effects, and if you're hardcore enough, the ones you'll ever need. They are infact included in the basic package, moo.fx.js.
Then in moo.fx.pack we have Fx.Color, to modify the color properties of your elements and Fx.Scroll, to internally scroll your long divs.
A completely rewritten Accordion has its own script now, with multiple options to let you decide every aspect of it.
For the nostalgics there is even moo.fx.utils, containing Fx.Height, Fx.Width and Fx.Opacity. moo.fx.utils is only useful if you want to toggle your values, and toggle only works with no padding/margin/borders, and in a strict doctype.
If it werent enough, moo.fx is now fully compatible with Robert Penner Easing equations, so there's also moo.fx.transitions in the package. Use it if you like to give your page a more personalized look!