Still working on the Photo API, I created an XPCOM module to use Dailymotion (a video sharing website pretty popular in France) in Flock.
It's in trunk only, and disabled by default. If you have a Flock tree, you can enable by de-commenting the line regarding Dailymotion in $c/services/Makefile.in. So far it just support the search functionality and channels. There is no account management and no media stream detection yet.