Cschwie,
Your video on Vimeo is great! How high were you flying? Did you use a spotter with binoculars? One thing I noticed is that the video is very stable, except when you start a banked turned.
The AVC codec is a variable bit rate; ie as the complexity and changing nature of the image changes, the bit-rate changes.
I just wondered if your video became "choppy" during your turns, on the original footage in the Webbie Cam, or just when you uploaded your clip to the vimeo website.
If your video was choppy, in turns with the original footage, you might need a faster ie. high speed Memory Speed PRO duo flash card.

This might be the problem for for 2thDr too. If your video with the Sony Webbie cam is choppy (and mine is smootheven when I fly a loop with my Ascent) the problem might be a slow speed Memory Stick card. My video is very stable, even in steep banks on a sailplane. I will try and upload a clip to Vimeo soon.

Here is the SanDisk flash card I am using now in my Webbie Cam. A 4GB card for only $29.00

http://www.jr.com/sandisk/pe/SAD_SDMSPD4096A/

320pilot
ps.Cschwie: I just watched your second video on Vimeo (the one that locks up!) I didn't realize you are flying with a FPV setup, and video goggles. WOW. Could you list all the components you used in this setup? I think the Sony Webbie Cam would be great for FPV, if you can transmit video in real time to ground based video goggles!