I just saw Gangs of New York tonight. Excellent! Don't miss this one, folks. I don't want to ruin or influence, so I won't elaborate.

Daniel Day-Lewis is superb. DiCaprio works fine here.

The Smithsonian article about the production and the historical background will enhance your appreciation of the film, as Scorsese really strove for historical accuracy here. Here's the article lin, full text...the above link was just a 3 paragraph abstract...the article is a worthwhile read in itself, especially if you're a history buff):

http://makeashorterlink.com/?D51031103

Just one caution: if you don't have a stomach for gore, you might want to pass. But it's hard for me to recommend anyone miss this one.