I always enjoy finding examples of bad web design to demonstrate the need for good design practices.

Check out the website for the Droid phone from Verizon.  Imagine that this is your website…then imagine your customers frustration trying to figure out where to go once they get past the annoying “skip intro” page.

Verizon's Droid Promotion Site

And for the biggest nightmare, imagine you want to add a new link to the menu.

This site is acceptable for a product launch that is marketed by various other means and is meant for entertainment purposes only.  It is cool from a graphic standpoint.  But if a serious customer had to deal with finding something in this site…dare I say, they probably would give up using it.