Here are some hints:
Turn "Record Sound"
off in Fraps and add music while editing. It just feels rather odd when you have videoclips with music and (annoying) audio, then a sudden blank space in audio, then some completely different audio and so on.
Stretch the video source or shrink the video resolution, the black bars just makes it look weird.
What editing program did you use? Either way, it could surely do with a higher video bitrate.
If it's your first, though, it's not bad at all.
We all have to start somewhere