Here's a link on capturing streaming video from the internet:
http://en.kioskea.net/faq/140-how-to...m-the-internet
In what application are you editing it and what are you using to record your voice? Built-in mic or a separate device?
I work freelance from home recording textbooks on mp3 so I might have some suggestions for improving the sound if I know what you're using to record yourself.