I am really excited about your new "Post by Voice" feature and enjoy audio blogging via phone on my WordPress blog.
There's only one feature request that I think would really compliment the post by voice feature and that is if other WordPress members could leave audio comments to our audio blogs. Since you already have a shortcode for your MP3 player, I don't think it would be too difficult to modify the WordPress comments system to allow the wordpress shortcodes so members can embedd the MP3 player, and maybe even video shortcodes as well. This is where the future of blogging is heading anyways so I think it would be a great idea for WordPress.com.
Thanks for reading,