Bible Gateway:  A free service for reading and researching scripture online-- all in the language or translation of your choice! Provides advanced searching capabilities based on keywords or scripture references, and various tools to enhance your study of the Bible.

Blue Letter Bible: Their mission is to facilitate in-depth study of God's Word through an on-line interactive reference library continuously updated from the teachings and commentaries of selected pastors and teachers who hold to the conservative, historical Christian faith.

The Evidence Bible Online.  This is put out by Ray Comfort.  Excellent resource for topics on evangelism.  A real good nuts and bolts on how to witness and the reasons for doing so.

 E-Sword  e-Sword is a fast and effective way to study the Bible. It is feature rich and user friendly with more capabilities than you would expect in a free software package.