Caring Bridge is what it says it is, a bridge from you (or your loved one) to people who care about your situation. Via the Internet site CaringBridge.org, you can easily communicate updates to people whom you choose to tell.
When you want to share a diagnostic test result, it's easy to let people you've designated to receive Caring Bridge updates know the news. Yay, Dad didn't have a stroke! When the oncologist decides on your mother's twelve radiation treatments to begin September 1 and end November 30, you can inform those closest to you of this decision. When you see that Mom feels nauseated for about two days after each Wednesday treatment, you can simply send a Caring Bridge note to please not phone on Thursdays and Fridays.
Recently, I learned that Caring Bridge also offers great advice on building and maintaining a strong support network. You can read it here.