if you are speaking of watching movies online then try Watchxonline.com or try torrent files from sites like mininova.com or btjunkie.com (keep in mind you will need a torrent downloader such as this one bitcomet.com)
If you’re looking for actual live stage performances, rather than movies, the first thing that comes to mind is PBS’s Great Expectations series. They don’t have a lot on their website at one time, but they’re excellent performances, and I’m pretty sure they add new ones as they show them on PBS…