I use Movie Collector, too, and I'm very happy with it! At least after they added a few of my most wanted features (Multi-disc support and movie tagging). The database, as Josh said, is probably nowhere near what DVD Profiler has got, but it certainly grows all the time. Collectorz.com are also working on an online facility á la Profiler, where you can show everyone your DVD collection.
My first dvd collection software, was
DVD Collector which unfortunately was suddenly abandoned

The latest beta was soo nice, and if development was started again, I'd switch in a second.
