I have heard that the Skogg Kettlebell videos are great for beginners because they spend a lot of time teaching good proper form. I think it's a system, so it might be more than you want to spend, but I haven't heard a bad thing about them! When I feel like I am ready for kettlebells (still a beginner at videos) I am going to get this.
KETTLEWORX has great videos - I started as a beginner with them. Moves are not difficult, but you'll want to start with a light kettlebell, maybe five pounds or less. I really enjoy them - they have a web-site.