Now that his WWII film is a hit, Tarantino is all over the place.  Here, he presents his list of five favorite WWII films.  They're pretty good choices:

http://www.msnbc.msn.com/id/32589447/ns/entertainment-movies/

If I were to broaden the list a little, I'd add:

Patton - George C. Scott is absolutely electrifying in the title role.  The film is big, REALLY big, and boasts a terrific script co-written by Francis Ford Coppola.

The Longest Day - Speaking of big, this movie boasts a cast you simply have to see to believe.  Granted, the subject matter is presented in a far more tame way compared to Saving Private Ryan (that tackled D-Day as well and would also make this sub-list), but it's still worth watching.

The following movies are meant to be pure entertainment, and while set in WWII, present very fictional plots:

The Guns of Navarone and Where Eagles Dare - Both films are based on novels by Alistair MacLean, an author who, during his lifetime was pretty hot but whose interest diminished after his death in 1987 (as of this writing, I don't think any of his novels are in print in the United States).  Regardless, both movies are pretty damn good, the former featuring an all star cast headed by Gregory Peck, the later featuring the oddball (but effective) pairing of Richard Burton and Clint Eastwood.

And finally, still speaking of Clint Eastwood, I have to again mention Kelly's Heroes.  A pretty big cast surrounds Mr. Eastwood, making this his only ensemble film (although he's still the star).  The plot involves U.S. soldiers trying to loot a bank on the enemy side.  It's a WWII comedy, believe it or not, and a pretty damn funny one to boot (of all of Mr. Eastwood's comedies, I think this is the best).

A quick add-on: How could I forget about John Frankenheimer's excellent The Train?  An absolutely stunning film featuring Burt Lancaster cast as a French underground fighter (this is the movie's only real debit...I had a difficult time imagining Mr. Lancaster as being a French) versus Nazis intent on taking their art loot back to Berlin.  A nailbiter with some serious, and heavy messages about the value of human life versus the value of high art.