Podcasting portal Odeo recently added a feature that lets people record messages on your Odeo page, kind of like a voicemail on the web. What's cooler is the message recorder can be embedded in any web page, so you can stick it in a blog post and anyone with a microphone can come along and leave a voice message for you. To embed it you'll need an Odeo account, but people don't need one to leave you a message.