http://www.desiringgod.org/ - The ministry of John Piper
http://www.truthforlife.org/ - The ministry of Alistair Begg
http://www.gty.org/ - The ministry of John MacArthur
http://www.heartcrymissionary.com/ - Indiginous mission we support (Paul Washer)
http://trainingleadersinternational.org/ - Mission that trains up indiginous pastors
http://carm.org/ - Christian Apologetics & Research Ministry
http://monergism.com/ -Calvinistic resource (sermons, articles, books, videos)
http://refnet.fm/ - 24 hour streaming radio station, featuring John Piper, John MacArthur, Steven Lawson, Alastair Begg, R.C. Sproul, Al Mohler, & more.
http://igracemusic.com/ - The ministry of Indelible Grace, a great resource of the great old hymns put to modern tunes.