jQuery never fails to amaze me. Even a run of the mill developer like me can create some stunning effects inside a web page. Recently I've been using the overlay function in the jQuery tools.
Next I plan on looking at jQuery mobile in conjunction with phonegap for some Android development... although I doubt that a recent idea I shared with @PaulOBrien will work with phonegap out of the box (due its lack of interaction ability with the notification bar). However I have discovered that there is a plugin that may help with that.