I'm not into tuts that are built into swf's but that's just me.
There was a bug with your music, one example (there were two that I found), is you press Play, the music starts playing. Then press 'Back', then press Play again. A whole new seperate music loop starts, and so.. yeah, no biggie though.
It's a good tut though, I skimmed through most of it, and looked at the source code. I see you used the rubber-band technique for getting to a point (dividing the distance by some amount). So, yeah not bad at all, you should really keep tutorials like this coming.. =)