I've been reading the blog "What is Christianity?" on my Google Reader for some time now. It elaborates on the questions in the explanation portion of Luther's Small Catechism (CPH 1991 ed.). I've added it to the Lutheran blog list in the sidebar. This would be a great blog to direct your friends who ask you, "What does it mean to be a Lutheran?"
Early in January, author Ed Engelbrecht posted a link to a timeline of Luther's life. You can find it by clicking here.