Two different home pages (one for members and one for guests)?

Hi there,

How can I create two different home pages on a WordPress site (or just allow guests to see a different page than the members do)?

I want to show my guests a plain page that will encourage them to register, while users see the Activity page of BuddyPress.

If it helps, I'm using a child theme of the BP Community theme from here.

Thanks,
Nathan