Wow, I didn't notice that, my blog (
http://GarySaid.com/ ) routes you to an iPhone friendly page (that is boring and I'm not particularly happy with, but it's fast and works well).
I'm not sure if that's technically a "drop down" since it's css and not html. I really think that's more of a CSS cheat that a web page function. (Don't hang me if I'm wrong on this detail).
Because of the unreliability of CSS menus, I always try to have the next page have all those menu options on the page (preferably at the top). BestBuy does do this on top of next page.
This also helps with the visually impaired if the text on the page so screen readers can show it.
Yes, my last two paragraphs don't address the problem but it's a "solution" that anyone might want to consider when developing web sites.
Tried to post this on the YouTube page but I was too wordy...
Gary