I recently ran across an interesting app for my smart phone: Coaches Eye.
It is basically a video app that has tools to allow you to analyse and mark up the video. It has a "scrubbing" wheel that allows you to move slow motion or frame by frame through the video. You really can pick up on a lot of little things when you slow a video down. I'd share my first video, but my form was less than optimal! Maybe after I work at it a bit, I'll post a clip.
It is available for Android phones, and the iPhone. So far, I've found it to be quite useful.