Film.com have listed their top 50 all time best opening scenes. Some amazing ones in there and you can have some fun ticking off which of the 50 you've actually seen. I scored 31/50 so I've got a bit of watching to do. I completely agree that their choice of #1 is awesome, but I would have put their #13 as the best. Mostly because it's my fav all time film but also because it truly is visual awesomeness.
My choice for #1 La Dolce Vita