I love our Roku. If you have Netflix, and haven't had a chance to check it out, it is worth a look.
For very little money, you basically get a pretty good "watch on demand" device that provides surprisingly decent-looking video. It is great for watching TV series, much better than waiting for DVDs and wading through DVD menus. The quirky movie selection will inspire you to try out a wide range of things you might otherwise not watch. The overall selection isn't perfect, in particular, the kids stuff that you can watch on demand is quite lacking. But all in all, it is well done.