Pure CSS Pull-Down Menus (non-IE)
If you're interested more in ideas for different implementations than a feature that can be used by the majority of the world browsing with IE, then check out Design Meme's simple Pure CSS Pull-Down Menus article. I really appreciate how simple the effect is achieved, and it would be interesting if anyone could still keep that simplicity (and lack of jabbascript) and create a version that works in IE.
Now, whether or not pull-down menus are a good idea is another question entirely.
via del.icio.us