Here are few links to some very good material from 9Marks:
1. The new 9Marks newsletter is available online. It is all about the gospel.
2. Mark Dever on the first of 10 sources of the recent growth in Calvinism (C.H. Spurgeon)!
3. Thabiti Anyabwile on being a gospel-saturated church member.
Thabiti's counsel is worth outlining here:
1. Know the gospel.
2. Desire to hear the gospel/preach the gospel to yourself.
3. Take the gospel to its conclusion (God is the gospel).
4. Order your life around the gospel.
5. Share the gospel with others.
6. Guard the gospel.
He ends with some recommended reading.