Web video lies
Those days it's easy to read things like: "Every decent browser supports WebM". So let me share some little wisdom: Things don't become true, just because Google tells so.
For instance Ubuntu 10.04.2 LTS does not support WebM, unless you activate some obscure PPAs. Maybe.
Firefox supports WebM only since version 4, which was released just a few days ago.
My smartphone also doesn't support WebM - because it has the shocking age of one year.
So please: THINK! before you allow someone to abuse you for their propaganda.
Deciding now if I am curious enough to waste time on figuring out webm support for my notebook.
Edit: Ok, at least Google's Mark Pilgrim agrees that WebM is not mainstream yet.