There's a fun article on Yahoo! that comments on the scientific inaccuracies of ten films from Armageddon to Total Recall to this summer's Indiana Jones and the Kingdom of the Crystal Skull.
Scientifically inaccurate movies link.
There is also a list on historically inaccurate films: link.
Here's another link to comments on Armageddon's inaccuracies: nitpickers.com