While movie reviewing can be fun, it can also be enjoyable to create movies yourself. When you want to edit your movies to add 3D animation work, OpenSim is a good tool to use, and best of all it is free. Second Life can be very effective for creating video for scenario-based eLearning courses because of its' ease of use, and OpenSim is also a great presentation tool. A basic format for a presentation would be to "film" a space with Fraps, touch it up with Virtual Dub, and then deploy as either a standalone video or as part of a Flash-based project.
The finished video from OpenSim is not as polished as that created with Blender 3D, but it is up to 20% faster to create and render scenes in OpenSim. Due to it's stability and ease of use, this software continues to gain in popularity. It works very well for the popular technique of creating 3D floating text.