Biblos - This site is probably the best for a scholarly study of the Bible online. It has a plethora of English translations, ancient versions, and foreign language translations.

The Scriptures: Internet Edition -This site is hosted by The Church of Jesus Christ of Latter-day Saints. It has the KJV Bible along with a topical guide that is a good help for studying the Bible.

Unbound Bible - This site is best used for its repository of downloadable texts, however you can view texts side by side.

Bible Gateway -This site is useful for looking at different English editions

Crosswalk -Mostly geared toward English study, but it does have an online lexicon of Hebrew. This however, is not very useful, since it does not show the word in the original language.

Christian Classics Ethereal Library - Has a good reference library of texts for aid in Biblical Study.