Lightweight? Put down the pipe and step away from the keyboard. For example, I've seen so many jQuery tabs on WP sites (those ones where you click the tab up the top and the content below changes) which require 50kb of Jquery JS - I found a not-even 1kb script off google that does the same thing. So 5000% smaller and does the same thing... hmm, I'd like to see this "its so lightweight" thing justified with an example. To me frameworks mean "I'd rather choose to be lazy and save myself time than do a proper job which loads as fast as possible". You can argue all day about how its quicker, easier or whatever - but you CAN'T argue that its "lightweight" in comparison to coding your own.