Quote:Gallery stats seem to work like "Mosted Viewed" etc
What gallery stats do you mean? There is a Zenphoto utility on the backend overview page. For showing something like the x most viewed images you need to add the appropiate functions of the image_album_statstics plugin
Regarding videos:
The most recommend file format would be .mp4 (note Zenphoto currently does not support the suffix .m4v!) or .flv if using the Flowplayer3 plugin. If you know all of your users use Macs you can use Quicktime (.mov) as well. Otherwise the two mentioned first.
Streaming is possible with the Flowplayer3 plugin but has not been built (and is not planned) in as it requires a streaming server and costly plugins for Flowplayer. See www.flowplayer.org about that. However Flowplayer works like Youtube as it starts to display what has been already loaded.