The primary ministry I am involved with is Prisoners for Christ. Based out of Woodinville, Washington this ministry helps prisoners in many ways. They offer a free bus service once a month that drives family members to prisons for visits. Also they offer a free inmate Bible Study Correspondence School (in which I am currently enrolled).
Prisoners for Christ also sponsors Christian services at a number of institutions. Pastors come into the prisons to preach the Gospel! They bring with them the healing light of Jesus Christ into one of the darkest realms of American Society; a place for the broken and contrite.
Check out http://pfcomweb.dreamhosters.com/ for a more in-depth look into their ministry. Learn how to get involved in bringing the Message of Christ to those who need it the most. Prisoners for Christ rely on donation to support their ministry.