Mark has put together a wonderful historical view of those great luxury liners. It also has a very fine web site that is probably the next best thing to visiting the museum. It is certainly a must for anyone planning to make the trip. A lot of the sites are were directly connected to or inspired by the movie. A lot of them have been neglected since the film has been around for a while.
People tend to lose interest.
But one site I found was around before the movie and will probably last long afterward. The Society has an actual building as its headquarters in Massachusetts and a printed periodical. They even have a gift shop, and this is available on-line. Here one can buy prints, models and even Titanic wearing apparel. Shop all you like.