The YouTube feed worked in HD without any stuttering or waiting for buffering. Vimeo had to pause the video after about 20 seconds.
This was tested using a very high-speed broadband connection from my office at the ETH.
Nice video... gives me inspiration to both buy a Flip Mino HD and to travel to the US.
I really like the Flip, mainly because it's so small and simple and still very usable and just "good enough".
The guys at Gizmodo seem to like a similar cam by Kodak (Zi6); and just today, Kodak announced a follow up:
http://gizmodo.com/5325151/kodak-zi8-wallops-flip-with-1080p-image-stabilizer-and-sd-slot
If I were you, I would wait for this. The SD card slot is great for longer trips; and the image stabilization is something I really miss in the Flip.
Certainly looks like the right option. Thanks for the tip.