I have always used pure css, as a menu generator and this is good, but converting it to aspx and including the compatibility is messy so I have been on the look out, and today I found a good one.
http://www.lwis.net/free-css-drop-down-menu/
What I like is they have real life examples, they use a few cascading style sheet files but that is cool since they have example from site you recognize, and that helps.
Only think I do not like is they use id= and class= and VS really only properly supports class for go to code, so you have to do a search all open after opening the many files
Comments
http://pixopoint.com/products/suckerfish_css