Then Jesus came to them and said, “All authority in heaven and on earth has been given to me. Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you. And surely I am with you always, to the very end of the age.”
Matthew 28:18-20 (NIV)
These are general purpose Christian ministries, typically (but not necessarily) associated with a radio ministry.
American Vision. AV's mission is to Restore America to its Biblical Foundation—from Genesis to Revelation.
Cross Examined. Conducts dynamic I Don’t Have Enough Faith to Be An Atheist seminars on college campuses, churches, and high schools.
Insight for Living. Website for Chuck Swindoll's Bible teaching ministry and radio program (listen online).
In Touch Ministries (Charles Stanley). A lot of stuff - daily devotion, monthly magazine and more. Listen to the radio show online.
Issues, Etc. Christ centered talk radio. You can listen online here. Lots of really good stuff, but I am linking to the Islam related stuff. There is much more. Recommended by "Paul of Alexandria." (new).
Key Life. Great Christian ministry, headed by Steve Brown. I used to listen to it on the radio in my commuting days.
Max Lucado. Pastor of Oak Hills Church in San Antonio, Max Lucado is author of countless books and also host of a radio program “UpWords, with Max Lucado”.
Reasonable Faith. Reasonable Faith aims to provide in the public arena an intelligent, articulate, and uncompromising yet gracious Christian perspective on the most important issues concerning the truth of the Christian faith today.
Unshackled. The original, from which the Unshackled Life Group got its name. Unshackled is a radio drama program from Pacific Garden Mission and has been on the air since 1950.