1. BibleGateway.com, which allows one to research Bible verses in many versions, and conduct all types of Biblical research.
2. Rick Renner Ministries' Sparkling Gems from the Greek: I became interested in learning more about the koine (common) Greek language, with which much of the New Testament was originally written in, thanks to the weekly Bible study led by my Pastor, Dr. Lucius M. Dalton, Senior Pastor of Mt. Moriah Baptist Church.
Learning the meaning behind the Greek words of the New Testament really provides me with a deeper understanding of the Bible.
I recommend the Web site, Renner.org from Rick Renner Ministries. Renner's site offers a Greek word of the week, which Renner refers to as the Sparkling Gem of the Week. Renner also has a book and CD called Daily Sparkling Gems from the Greek, each of which contain his complete collection of lessons about New Testament Greek.
You can sign up for Rick Renner's mailing lists, including one that delivers a Greek word to your inbox several days a week.
3. The BibleStudyCafe, Ancient Greek word of the week is Gnosis, which means "knowledge"
The definition of Gnosis from bible.crosswalk.com:1. the general knowledge of Christian religion
2. the deeper more perfect and enlarged knowledge of this religion
An example can be found in Romans 11:33 from BibleGateway.com: "Oh, the depth of the riches of the wisdom and knowledge of God! How unsearchable his judgments,and his paths beyond tracing out!" (New International Version)