MP3 takes more server resource to encode.

Flash attachment is like using a hammer to fix a small issue. Your browser must have an application handler configuration. For example, Firefox tools-options-application, but it's easier to just configure from the OS (e.g, Windows http://support.microsoft.com/kb/307859), then your browser would most likely prompt you to either save or open it with the associated application. XMPlay is a lightweight audio player. When I click on the WAV attachment in my Web-based email using Firefox, I get the option to play it. With Opera, it just plays when I click on the WAV attachment.

That said, we're hijacking this thread. And I still would like to have Google Voice option, Tim