All who consider themselves evangelical Christians owe much to the Reformation. Luther and those who followed him (and some who preceded him like Wycliffe and Huss) led a movement which resulted in the recovery of the biblical gospel. In the providence of God, this 16th century movement still casts its light into the 21st century. Thank God for the men and women who were willing to give their very lives for the truth of the gospel.
This article by Michael Horton, though written in 1994, is a good synopsis of the basics of reformation theology and how why that theology is still important for us today.