Today I came across two excellent websites from Luther Seminary (yes, it is my alma mater . . .). The first is called Enter the Bible: http://www.enterthebible.org/ and it is essentially a free Bible encyclopedia written by the faculty at Luther. It provides summaries, outlines, maps, history, art, and much more on every book of the Bible. It is great for background information, Bible study groups, and quality entry level biblical knowledge.
The second is called Working Preacher: http://www.workingpreacher.org/ and it has a variety of ecumenical scholars giving insight on every individual lectionary text for each week. Each separate text has a different author. Many other resources are on this site as well.
Check them out!