Sofa OpnPress theme is tailored to enable users to make entries (Posts) via front-end. It means that site users will actually never have to access Admin dashboard to submit new post, edit existing one or delete.
Site owner can also make a few bux because OpnPress theme has built in deposit system which works with PayPal. It's up to you to decide whether user submissions are free or require certain fee. Either way, it's very easy to set it up from theme Options page included in Admin panel.