True, but Alex Proyas project mysteryclock.com is completely flash based (warning: i'm not recommending this neccessarily - it takes over your screen completely and takes quite a while to load)
Feeder, I am sorry if I assumed you weren't an arthouse buff (surprised that you haven't even heard of requiem for a dream then though), but glad to hear that you are as that is where real filmmaking is at! I work in the tv industry as an editor, so consider myself to have a little understanding of the entertainment industry. I do web sites on the side. I completely agree that there is a time and a place for flash - my own site doesn't use any at all for fear of excluding the small minority that doesn't have it installed. I think I actually agree with most people in this thread that flash has a time and a place - I just considered that the requiemforadream site was a site that used flash well and had considered its audience, guess we disagree :)
Dante_Maure, I'm afraid I have no statistics on ROI for that site though, but do wonder whether that is the only measure of a site's success? For me the web is a communication platform first, marketing outlet second. I guess I probably strayed from your original outset - my apologies.