My favorite ballroom dance movie is "Strictly Ballroom" - I think it was an Aussie film. Still love that one. "Dirty Dancing" is a classic - that's the movie that got me interested in ballroom. There is some tango featured in "Scent of a Woman", and "True Lies".
"Shall We Dance" isn't too bad, and "Dance With Me".
I heard the movie "Silver Linings Playbook" includes some ballroom dance too.
On TV, the new season of "Dancing With the Stars" just started. If you are a general fan of dance, I'm sure Fox will have another season of "So You Think You Can Dance" which typically includes at least one or 2 ballroom routines per week.