if you're worried about Google ranking iframes are the worst thing you can do. They're also bad for usability since they can't be book marked without popping out of the frame.
I would suggest setting it all up on the server yourself. It's ridiculously easy to install. You've seen BinaryJoy and know that's entirely wordpress, as is BinaryMoon my personal blog. Don't worry about separate domains. I would just use wordpress and remove your current site. Wordpress supports pages so you can just add your game content that way - it would make the theme and templating a lot easier to control and keep everything consistent.
BTW Wordpress rocks - good choice. Have you seen the Regulus theme on wp.com? That's mine that is :)
I would suggest setting it all up on the server yourself. It's ridiculously easy to install. You've seen BinaryJoy and know that's entirely wordpress, as is BinaryMoon my personal blog. Don't worry about separate domains. I would just use wordpress and remove your current site. Wordpress supports pages so you can just add your game content that way - it would make the theme and templating a lot easier to control and keep everything consistent.
BTW Wordpress rocks - good choice. Have you seen the Regulus theme on wp.com? That's mine that is :)