mooCrumbs hides your breadcrumb trail in an elegant way and re-appears again when the user hover over them.
Again it has a few nice options so that you can change almost anything you want.
These options include margins, padding, background arrow image, position of arrow image, speed, transition type, initial width, whether or not you want to inject an 'li' to act as the button, as well setting the html of that ‘li’ and much more...
Hover over the ‘view crumbs’ text below to see it in action: