Daily Game posts a new flash game on your blog once per day (or less).
Playedonline.com is a big gaming site with thousands of great flash games. The games are free to use and post everywhere on the web, including your blog!
Send a mail to dailygame [at] playedonline.com with as many details as possible. We will gladly assist.
Played Online's blog is a great place to check : http://www.playedonline.com/blog/