Thanks for the movie info guys.
I actually have Primer in my NetFlix Instant Queue, so I'll have to check that one out tonight.
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One classic that I don't think anyone has mentioned is Glengarry Glen Ross. While not specifically trading related, it's a real gem in that it shows the high pressure, high stakes, cut throat environment that inhabits many a brokerage office (regardless of the commodity being sold).
Two for the Money is also tops on my list (to show what love-of-money can do to you). I also like Rounders ... low key, and Gretchen Mol never had the chops to make it in the big-time, but the movie is still worth watching.