Another one that just occurred to me is Mystic Knights of Tir Na Nog. it's kinda like D&D meets power rangers.
I just threw up a little.
Movies that have the D&D feel (party of characters, epic fantasy, weird humor):
Hawk the Slayer
Willow
Krull (no demi-humans, and horrible music, but still)
Monty Python and the Holy Grail
Mulan (yes the Disney version. Okay it may be based on a Chinese myth, but the way they handled the writing, someone was playing D&D during the scripting)
Dungeons & Dragons (the Saturday morning cartoon series) - trite yes, but used actual items, monsters and memes from the game - mostly because EGG was in California at the time as a technical adviser.
Slayers - while I don't actually enjoy this series, every episode was based on their running D&D campaign. Evidently some of the dialog was word for word from character encounters.
D&D : Wrath of the Dragon God - No academy awards but at least it was better and truer to the source material than the first one.
Conan the Destroyer - Not as good a movie as the first, but much closer to D&D. (The AD&D module was fairly faithful to the movie too).
Legend - okay so the faeries were almost as tall as Tom Cruise. But Tim Curry as the evil demon - pure freaking magic. Besides, there were different races, magic and a party rescuing the princess (and a unicorn) - sounds like D&D to me.
The Dark Crystal - very much on the fringe but I had nightmares about the skeckies for weeks after I saw that movie.
The Neverending Story - The first one was awesome, I even named one of my early character's Atreyu (the rest don't qualify)
Movies mentioned here that DON'T fit :
D&D the movie - utter crap with a thin veneer of marketing - no that's too good a review
The Dragonlance cartoon - Part cartoon, part live action all garbage. And I thought the novels were bad. *rolleyes*
Beastmaster - Both the movie and the TV series. While I liked both, they never felt like D&D to me (maybe more like GURPs).