William Forsche has dipped into his video archives and posted over 11 minutes of Ghostbusters 2 storyboards. The detail is good, not high, but you get a LOT of storyboards.
Check it out here and be sure to let him know how much you appreciate him posting them.
A second video he posted over the weekend has a few more storyboards, and some great video on other GB2 art, making up slime, and more. Check that video out here.