As everybody has already mentioned, Re-Animator is GREAT but be warned that it doesn't follow the source material as closely as a lot of other stories. I for one kind of liked the Masters of Horror offering from Stuart Gordon (I love Gordon's stuff) Dreams in the Witch-House and thought it stood well alongside the story. Don't forget to check out the upcoming From Beyond stop motion movie, it looks VERY good and there's a trailer here...
http://www.frombeyondmoviepage.blogspot.com/