Eén:

The Google Font Directory lets you browse all the fonts available via the Google Font API. All fonts in the directory are available for use on your website under an open source license and served by Google servers.

Twee:

http://www.webmproject.org/
http://openvideoalliance.org/2010/05/google-frees-vp8-codec-for-html5-the-webm-project/?l=en
http://www.h-online.com/open/news/item/Google-open-source-VP8-as-part-of-the-WebM-Project-1003772.html
Container will be .webm, a modified version of Matroshka. Audio is Ogg Vorbis.
YouTube is serving up .webm *right now*. Flash will also include .webm.
Comment from WMF already, that WMF is happy to host any free codec.
Encoders are available at the project home page.

There’s a session this afternoon at Google I/O that will focus on this:
http://code.google.com/events/io/2010/sessions/webm-open-video-playback-html5.html

‘t Wordt nog wijs.