What is Orthodox Christianity?
The Orthodox Church is the Church founded by Jesus Christ at Pentecost, and preserves the fullness of the apostolic faith believed by Christians from the beginning. The head of the Church is Jesus Christ Himself, to the glory of the Father, lead by the Holy Spirit.
Here are some great links about what Orthodox Christianity is, as well as what makes up the Orthodox Christian life:
http://www.westernorthodox.com/
Also, the blogs in the Blogroll and the other links provided give great info as well.