In no particular order.
1. Jim Henson's The Storyteller - Greek Myths
Yes, his is more suited to children, but is still adorable. The myths are rewritten to teach happily-ever-after morals and such, as a kid-friendly show will, though this series doesn't change as much as most do (i.e. Disney's Hercules).
2. Jason and the Argonauts
This version is one of the best for this story - my only real complaint is the death of Hercules. Everything else makes me happy and little else totally upsets my well-tuned sense of mythological accuracy.
Focuses on his younger years. Though the story of Hercules is fodder for every kind of personal interpretation, and most are really, really bad - albeit entertaining - this is pretty good. I love the way Hercules is treated in this version. Be warned... quite a bit is wrong.
With English subtitles. Great, great movie! If you haven't seen it, you NEED to!
5. Wrath of the Titans
Less well known as the previous movie, Clash of the Titans, this one is better, mythologically. My favorite part is the cyclops - incredibly well done and someone on the writing staff knows their mythology. In fact, I'm pretty sure at least one writer was a classicist.
With English subtitles. This movie has some older stars - like Kirk Douglas. I love this version of the Odyssey. A great, older movie well worth the time to revisit or get to know.
7. Percy Jackson: Sea of Monsters
Of the two in the series, so far, this is by far the better one. Better mythology and better acting. Even if you haven't read the books or care about the teen novels, this is a good movie. It is entertaining and just intellectual enough to be stimulating for well-seasoned adults.
Not the best, mythologically, but better than most and has some great action scenes of all time! Besides, Brad Pitt is a hottie and no matter what happens in the movie, he does make it enjoyable.
9. O Brother, Where Art Thou?
Are you surprised this one's here? You shouldn't be. This is a wonderful re-adaptation of the Odyssey story. "Modernized" to make everyone like it, but still so much mythologically correct about it that even die-hards like me are in love!
10. My Fair Lady
What about this one? You knew about My Fair Lady, right? This is the story of Pygmalion - he who falls in love with his own creation. Luckily, Aphrodite agrees it is true love and makes her real. I don't know if Pygmalion really could sing - but, Professor Higgins can, and he's good!