Therapix gives a nice tutorial on how you can build a green screen from poster board at wal-mart or your office supply store for as little as $5. After building this economical green screen, he shows you how to create outstanding backgrounds using Adobe After Effects. If you use Sony Vegas, watch this video tutorial. If you use Apple iMovie, here is a tutorial on blue & green screen.
Have I left any other video editing programs out? Leave a comment below and I’ll search around and find a tutorial for you. Also, I recommend that you subscribe to Therapix’s videos as he adds new tutorials on a regular basis.