There are many online study resources!
Online Bible Resources:
Bible Gateway - Provides a nice search feature with many translations and lots of additional information.
NET Bible - The New English Translation
Bible Crosswalk - Another nice search feature with many versions online, includes Strong's numbers!
Parallel Comparison - From the folks at Crosswalk - compare texts of two different translations!
Bible History.com - TONS of Bible information, history, maps, geography, timelines, etc etc etc
Public Domain Dictionaries:
Baker Evangelical Dictionary of Biblical Theology - From the folks at Crosswalk - one of the finest Dictionaries in use today!
Public Domain Commentaries:
Crosswalk Commentaries - Many public domain commentaries, including Scofield's notes and Wesley's notes!
Public Domain Concordances:
Bible Study Software:
E-Sword.net - A nice, basic system with many resources and a good search engine. FREE!
Gramcord.org - A nice tool to work with original languages, many versions and reference materials
Logos - The cream of the crop (high end)! $150 - $600.
Greek / Hebrew Information:
Lexicon- From UnboundBible.org, enter a word and determine the Greek or Hebrew meaning/equivalent
Foreign Language Versions: