Drop Down Navigation Menus

We generally don't advocate these kind of drop-down / fly-out type menus - not great for browser compatibility/web standards/SEO etc - but if the client demands it, despite your advice to the contrary, they've got to have it.

This is a good one we've found. Very simple, making more prominent use of CSS as opposed to Javascript, easily customisable...

We've seen a few full CSS versions around, which are better in theory, but lack some of the sort of features demanded, due to the inherent limitations of CSS in this sort of application. Anyone found a decent full-CSS drop-down/fly-out menu, let us know.