@tubebender: AFAIK there is no way to connect an external mic to the GoPro - yet. That's why I'm using a Zoom H1 audio recorder with an external lavalier mic, gaffa-taped on top of the rear fender.
@kevhunts: I've got a LeoVince Evo II with dB-killer:
http://www.leovince.com/en/catalog-yamaha/terminale_factory_omologato_evo_ii_passaggio_standard_xt_1200_z_super_t_n_r_i_e_2010/12655
@Tabasco: I have set my camera to PAL. I use "r2" (=1280x720px @ 25 fps) when the cam is in the chest mount. Then "r2" is good enough, because there are only few vibrations. That format yields videos small enough to upload them directly to Youtube without re-encoding.
When I install the camera directly to the bike (usually to the crash rail next to the headlights), I use "r3" with a higher framerate and bitrate, because then the engine's vibrations corrupt the video quality. Before uploading, I re-encode these videos because otherwise they are freakishly huge.
IMHO "r5" doesn't improve the image quality because it is merely upscaled. Also the field of view is narrower, which would make it a good setting if you're trying to film a buddy riding in front of you.
You can find all of my videos in my youtube channel:
http://www.youtube.com/user/christophschm?feature=mhee
Now some of my favourites. I hope everyone knows how to view fullscreen and 720p HD (when the video is running, click on the "360p" below it and change it to "720p", then click the symbol with four arrows on the right).
Rossfeld panoramic street, close to Berchtesgaden (cam on bike, GoPro's audio):
Roßfeld-Panoramastraße
Lago Valvestino, Northern Italy (chest mount, Zoom H1 recording):
XT1200Z Lago di Valvestino - Navazzo
Passo Baremone, a rather adventurous mountain pass in Italy (chest mount, Zoom H1 recording):
XT1200Z Passo Baremone / del Marè
Grossglockner Alpine Road (chest mount, Zoom H1 recording):
XT1200Z Großglockner (2) Edelweißspitze - Hochtor - Franz-Josefs-Höhe
Passo di Giau, Italy. Scenery kicks in @ 8:00 min
XT1200Z Passo di Giau (1) North
Grödnerjoch, Italy. Check out the beginning and the pass's summit around 8:00
XT1200Z Grödnerjoch (Passo Gardena)
A nice little road in Southern Bavaria. I put the cam on a friend's
XT1200, so he's filming me (GoPro's audio):
XT1200Z x2 Rott - Diessen am Ammersee
Enjoy! I might not be around for questions, because tomorrow I'm leaving for a trip to Gibraltar/Spain ;D
P.S. If you watch the videos on Youtube, most of them habe descriptions where I filmed it. Just expand the video description ("Show more"...)