Hoi,
The use of .ogg files is a chicken and egg situation. Yes, we want people to use .ogg files but when there are no .ogg files people will not download the stuff they need to listen to it. There are many people who do not upload soundfiles because it is not .wav or .mp3. There are no sound files because people do not create them.
I propose that we have an ommlette and break some eggs. I have uploaded some Dutch politicians, and I was really happy with the "George Walker Bush" soundfile that I together with "Silvio Berlusconi" and "Jaap de Hoop Scheffer" added to those wikipedia that have an article about these gentlemen. Today I received the first installment of a large collection of the pronunciations of Italian politicians from Sabine Cretella. They are now available on the Commons. :)
What is needed to make this happen is people to record in the .ogg format, upload it to Commons and make this the standard that it is; the soundfile to be used on the Wikimedia projects. When we /show /that we care about this standard, we can ask Mozilla.org to create a plugin. By showing that we care, we make a difference.
By having LOADS of soundfiles in the .ogg format we can make this format really relevant.
Thanks, GerardM