From Youtube:
In the upper right hand of the page, next to the video is a box with a link and an embed code.
To embed this video right onto your blog copy the code (Ctrl+C) in this embed box.
From Google Video:
On the right side of the video is a link that says "Email - Blog - Post to MySpace". Click on this link.
When you click that link some more links show up. Click on the one that says "Embed HTML".
If you want to embed this video right onto your blog, copy the code (Ctrl+C) in the embed box.
Into your Blogger Dashboard:
Paste the code (Ctrl+V) you saved earlier right into the text area.