Picture of Easy iPhone Tripod Mount
I have a mini tripod that I love to use on my digital camera. It's light, portable and an all-around good product.  Once I got an iPhone, I wanted to use the tripod for that as well. 

Step 1: Parts & Tools

Picture of Parts & Tools
We won't need much:

7/16" nut & washer
iPhone with a hard case (not shown)
simple and effective!
cool, you should upload a video, I'd love to see what it looks like when you're biking