At the moment, StumbleUpon but I am going to try and use MySpace soon to help. I have used YouTube but with limited success. Infact, I wrote about using YouTube in a blog post (the blue one in my sig). Take a read if you are interested
I will recommend Stumble to get more traffic; but you cannot cash in on with that traffic and the visitors from SU rarely spend more time and take care to read your contents. These are the problems
Myspace due to the nature of my site (myspace layouts site), but stumbleupon still give me pretty good traffic too.
I like all three. Myspace spam and stumbleupon is not as good as digg to me. So i must go with youtube. I have one popular video on youtube, with my url on it and it gets a lot of traffic.
I'd go for stumbleupon, it gives the site I handle an average stats of traffic every day, and I frequently used it than other choices
Interesting. If stumbleupon wins this poll i will be shocked. Because i have spent so much money on advertising and optimizing my rankings on stumbleupon and i get no traffic at all from it. Anyway we will see how the poll goes. Joey112