My I recommend my own plugin to this list? I might be a bit biased, but I think it could be very useful to people. I'd love to hear your opinion of it or even a review... http://www.warkensoft.com/products/amazonfeed-w...
Not sure what differences there would be except that they're different companies. Text-Links.ca looks like it's quite new. I've been trying them on my own site. Pretty easy to get set up and installed.
I would see this as boycotting. The information is still available. Anyone who wishes to can go to www.discussdavinci.com without having the theatres get in the way. The theatres simply have chosen not to advertize it.