Many websites have drop-downs to assist navigation. Usually this only applies to big sites where sitemaps are necessary and where you want people to get to any part of the site from the home page in one click. Sadly I've never had the challenge to develop any web sites that are that big and diverse in content but there's a time for everything.
What is not so on about this is the HTML source. It's built in true 1997 style with 242 spacer gifs!! and no respect what so ever for blind people. Look for example at this screenshot when I used Lynx and the home page uses 236 table cells!!.
Anyway, I like what they did with the drop-downs so I'm not going to have a go at Lufthansa about their ridiculously long and counter-intuitive URLs.