Here’s an example of a quick recording I just made:

Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

You can play recordings in your blog once you have uploaded them to your server, using an audio widget. I recommend Free Audio Player.
You can download it at: www.wpaudioplayer.com

I also recommend Free Sound Recorder to make high quality recordings quickly, easily and without any fuss.
You can download it at: www.sound-recorder.biz