@jdalton: Totally agreed with your analysis. I think both libraries offer pretty similar functionality but differ in the way they trade off elegance and power.

In Prototype the selector method, $$(), returns an array.
You can then use the ‘invoke’ method to call a method of each of its items.

$$(’a.offsite, a.offsiteWide’).invoke(’observe’, ‘click’, function(){
var width = this.hasClassName(’offsiteWide’) ? 1050 : 800;
…..

At first glance this may seem unnecessarily verbose but the real power comes in
not being limited to the methods attached to the array (or the jQuery object).

For example on an array of strings I can call ‘truncate’:
arrStrings = arrStrings.invoke(’truncate’, 10);

Or on an array of dev defined objects:
var calculations = arrCalcs.invoke(‘doComplexCalculations’, arg1, arg2);

It’s chainable as well:
$$(’#windows div.close’).invoke(’addClassName’, ‘active’).invoke(’show’);

Your “take-home” can be applied to Prototype as well.
Great article, just though I should clarify some of the prototype info.

-JDD

.hover(
function() {
$(this).toggleClass(’hover’);
}
);

All of your other examples still have a lot to polish.