Thanks for your time and effort in trying to create a voice recording tool that doesn't need a Java server. I've hunted around for various solutions and I came across and interesting plugin for Wordpress: http://mtr-design.com/en/projects/mtr-podcast-recorder/
It uses the LAME MP3 CODEC (open source) which is the best in the business, open or closed source.
It doesn't require a Java server and records directly onto a server using PHP. I've tried and tested it successfully on my LAMP setup and on a public LAMP server (in Wordpress only). I think recording to a server gets around a lot of problems that users can experience when they have to upload files.
I hope this'll be useful to you.
All the best,
Matt