Apperance is everything. That’s pretty much what goes around. Great SEO, cache and performance does often fall in the shadow of apperance, but that doens’t need to mean that pages that have great SEO, cache and performance have to look ugly. One trick to make a website look nice and trendy is to put your time on making a nice menu, but make sure to have a good fallback because apperance alone wont take you far.
Anyways, over at devsnippets, you can find ten great technices on how to make your multi-level menus look great using jquery, mootools and some other goodies.