There are a couple I have in mind. Like many techies, I am a huge fan of RSS for content distribution and XMPP for federated communication.
The really niche one I like is S-expressions as a data format and configuration in place of json, yaml, toml, etc.
I am a big fan of Plaintext formats, although I wish markdown had a few more features like tables.
Out of curiosity, why ogg as opposed to other containers? What advantages does it have?
Definitely agree on the Opus part, but I am very ignorant on the ogg container.