What is the Orthodox Church?

I, personally, try not to associate the Orthodox Church with the Catholic Church.  While we have similar Sacraments, there are great differences.  I've run across quite a few people who have had run ins with the Catholic Church that have left bad tastes in their mouths.  I prefer to keep it simple, similar to Andrew, and say the Orthodox Church is the Church of the Apostles; the Church that has been since 33 AD.  And, as Luke mentioned, those that are truly interested will jump on the "Come and See."  

I'm far from being this way, but if we are each icons of God, then others will be intrigued and will want to know how we have come to find such Joy and Peace...St. Seraphim comes to mind...