BuddyPress.org

“themes” is a themes folder for WordPress(MU); whereas “bp-themes” is a themes folder specific to BuddyPress components.

To be more specific, “themes” styles the blogs; “bp-themes” styles the member profiles and groups.

ReadWritePoem’s blog posts is from the main, primary blog… it’s a simple template loop from WordPress… nothing elaborate there. In fact, looking into it further, they do not have member blogs! So if you’re familiar with regular WordPress, you’ll know how they placed the blog posts on the front page.