Months after the hottest debated ending in history (I will put Planet of the Apes remake and the TV series Dallas up there), David Chase has come out and publicly explained that Tony Soprano did not die at the end of the series, nor was there any hidden meaning in the ending.
The world debated onion rings, the song playing (Don't stop believing), and a members only jacket. In the end it was just the show the died, no different that it began -- from darkness.
Read more about it here: http://tv.msn.com/tv/article.aspx?news=280761>1=7703
Tony Lives! (At least until the third movie)