Nathan White announced the mootools 1.2.3 release today. This is to be the last version prior to bumping everything into mootools 2.0.
Although mootools 1.2.3 is mostly about bug fixing, it does introduce an important feature: “Element: MooTools compatibility mode: the $ function is only defined if no pre-existing $ function is found. If an existing $ function is found, you can use document.id()”
In reality this means that mootools will be able to co-exist with frameworks such as jQuery (or others). It will still not work alongside Prototype, for example – extending prototypes just cannot be namespaced. Also, even though you now CAN use more than one framework at a time, you probably shouldn’t do so on the same page, its a wasteful and needless practice.