I've known for a long time that Thomas Edison's adaptation of Frankenstein was available online, but I just recently learned where. You can either go see a nice, big version at Internet Archive or just stay here and watch the smaller version below. It's only thirteen minutes long and it's surprisingly effective and suspenseful.
Pride and Prometheus
As long as I'm linking to free Frankenstein material, how about this Jane Austen/Frankenstein mash-up novella by John Kessel. (Thanks, Frankensteinia!)
Kevin Grevioux (creator of and actor in Underworld) is working on a Frankenstein comic and movie. It's an action story where the modern-day Monster carries guns and meets up with other famous monsters like vampires, werewolves, mummies, goblins, ghosts, etc. Sounds good to me. Just keep Stephen Sommers far away from it.