Among other things, the film is notable for the appearance of a 25-year-old Clint Eastwood in an uncredited role as a jet pilot at the end of the film.
GoogleVideo has it online:
1000 Misspent Hours says that "Technically speaking, the movie is comparatively good," calls it "a pretty well-made flick" and says, "you could definitely do worse than this for mindless entertainment on a Saturday afternoon." Moria says that "As a monster movie goes Tarantula is quite good".
7/7/2009: Only the Cinema has a review.