Beanz: one other forum member occasionally posts videos, though he has been raked over the coals at times for his aggressive approach to intersections, red lights, and so forth. In case you have not seen his videos, I do think he has a reasonable sense of how to edit/add audio:

Best of 2009

Commute

8 Track Ride

Obviously he's not using the same camera as you have. But, he seems to have more practice at this sort of thing, so perhaps you can get some inspiration or ideas from his videos.