Marginally useful jQuery development plugin. Outlines a jQuery object, then returns the jQuery object for chainability
Visually answers the eternal question: "Have I actually found the element that I think I've found?"
Ad-hoc outlining:
$('#foo').o_O();
// #foo gets a semi-transparent pink outline
$('#foo').o_O('blue');
// #foo gets a blue outline
$('#foo').o_O('black').on('click', function() { ... })
// #foo gets a black outline, then binds the event