Here's an old post by Josh Harris called time to cheat my blog. I've read it before, but it spoke as clearly to me now as it did then, and I think I need to read it regularly. So I'm posting a link it here!
It's not just for people who blog, but for any of us who let email / computer / work / etc. creep into our times with family and friends. Have a read! You might be as challenged as I was.