Some good websites
Desiring God Ministries
John Piper is a faithful teacher of God's word. True, full, and practical love of God as worship and the fulfillment of Christian duty is a central theme.
John Piper's Sermons
This is where John Piper's online sermons are located. Good stuff and nicely organized.
Church in Focus
I really enjoy writing that sticks tenaciously to Scripture, and that is what I see here.
Grace To You
John MacArthur is another man, who has greatly influenced my thinking. He is a great defender of the Faith.
The Spurgeon Archive
Charles Haddon Spurgeon is called the prince of preachers. His teachings are accessible, while profound. Truly a blessing.
The Hall of Church History
Phillip R. Johnson is an elder at Grace Community Church (with John McArthur) and a wonderful teacher of God's word. Don't get confused with the Phil Johnson who writes on creation vs. evolution, who is a professor at UC Berkeley, it is a common name.
Pyromaniac Blog
The original Pyromaniac blog of Phillip R. Johnson. If you are wondering pyromaniac comes from being on fire for God and God being a consuming fire. While closed (i.e. no new additions) there is still a wealth of great stuff. As a side note, he has some of the coolest advertisement graphics.
Team Pyro Blog
The replacement/follow on to Pyromaniac blog. Lots of good stuff.
John Bunyan Online
John Bunyan wrote more than Pilgrim's Progress. He was a faithful teacher of the Bible, and many of his views line up with New Covenant Theology.
Ligonier Ministries
RC Sproul has been a very influential person in my life through books and conferences. While I don't agree with him on some issues, he has my respect. I have to admit his ministries attacks (to my knowledge he has not attacked personally, but you are accountable for the ministry you lead) on New Covenant Theology, was sadly uncharacteristic of his usual behavior, was sloppy in its content, and has caused me to no longer get Tabletalk (his magazine). I still find many of his books useful, and recommend them. We all have feet of clay.