Adopt-A-People Clearinghouse has a lot of information on unreached people groups & who is working with them.
Brigada Today publishes articles from Doug Lucas and Tina McCormick of Team Expansion every week. They have many mission-related resources.
Davd Mays, former Director of Learning Inititiatives for The Mission Exchange, had helped hundreds of churches to greater missions commitment and effectiveness. Through his leadership, The Mission Exchange offered workshops, seminars, conferences, consultations, articles, and manuals. Mission resources by David Mays are available on the website of The Mission Exchange.
DualReach serves local churchs and the church mobilization arm of mission agencies. They provide quality training, consultation, and missions education resources.
Joshua Project is an organization focusing on researching ethnic people groups for mission and evangelism target. Their information about the ethnic people groups are always updated. Their resources are free and you can get them on their website.
Mission Frontiers is an online magazine that publishes issues bi-monthly. It is run by Frontier Ventures. Their aim is to foster and support indigenous and self-reproducing Church-Planting Movements among the 7000 unreached peoples of the world. Online subscription is free.
Mission Network News
MNN is one of the best sources of daily world news about mission and other Christian topics. You will find many mission stories on MNN.
NavPress is the publishing department of the Navigators. Through it, Navigators publishes life-changing products that are biblically rooted, culturally relevant, and highly practical. They have a daily prayer guide for unreached nations and peoples. The prayer guide comes out monthly in magazine format or daily as newsletter.
Operation World is written by Patrick Johnstone. It is the number one resource on prayer for the world. This book profiles every country in the world along with prayer requests from missionaries in each country. Operation World is available in book form, CDs, and on a website.