Whenever you want to find a database on a certain subject, you have to ask yourself who would spend the time to create and update such a site and for what motivation, and who pays for the time & labor.
In other words, there is no website devoted to collecting data on how movies are shot. How would all that data be collected? The closest is the IMDB under the "technical specs" link, but it is minimal and not always accurate either (which is the problem with an almost volunteer-run system...)
Your best bet for current movies are magazine articles in American Cinematographer, ICG Magazine, etc. but obviously only a few movies are covered per issue.
