Here's some mast top footage:
http://www.formula16.org/videos/zandvoort1.movor
http://www.formula16.org/videos/zandvoort1.wmv(same video, different format)
Mount it on the front of the mast with a wide angle lens and you get a pretty good view on both tacks.
Here's some spin pole footage:
http://www.formula16.org/videos/mumbles.movAgain, wide angle lens so you can see the crew on trapeze.
These are both done with a helmet cam wired to a hard drive video recorder (the second is done with a particularly cheap and nasty recorder which got replaced). I keep the recorder in the tramp pocket, which allows you to turn it on and off easily.
Paul