My friend Dan Barham is a well known pro mountain bike/outdoor photographer who recently did a commercial mountain bike project on film which I thought APUG might be interested in. I don't think it's very common to see film in the action sports genre these days.

He's a Canon guy so he shot with a couple of Canon bodies (AE-1 and EF) and a 120 Holga. There is a video at the bottom of the page where he talks a bit about shooting with film.

http://acre-supply.com/journal/dan-barham-WANDER.php

There's a book available, I have a copy on order but can't provide any review of it at this point.