You can be a member of many prayer chains and prayer groups. You can even start your own. You can build your own website and have a prayer form where people can enter prayer requests which will be delivered to you by email. If you have such a website you can become a part of similar prayer ministries by linking together in a web ring. You are welcome to become a part of my prayer group which has over 400 members scattered across the world.
Members send and receive prayer requests and send inspirational materials to the group as well.
A missionary in Japan writes a devotional each week which he sends to the group. Others forward devotional materials they receive. The Southern Baptist Convention has some excellent resources at their website to involve you in prayer ministry. Many prayer requests are posted at the SBC website. Other resources can be found at the North American Mission Board website.