I'm sure quite a lot of you know about these but for those who don't, I thought I would share.
biblestudytools.com - you can search almost every translation known to man. It has KJV with Strong's so you can click on a word and get the Strong's definition & how the word was translated diferently in different scriptures, etc. It has tons of commentaries you can study. I would advise using the advanced search option.
http://e-sword.net/ - This is free downloadable software for bible study. There are tons of add-ons you can purchase at reasonable prices also. Go to this page,
http://e-sword.net/features.html. It explains all the features and gives you screen shots so you know exactly what it does. VERY cool.
http://bible.cc - A great resource as well. It has a paralell bible feature where you can read a verse in like 12 different versions all on the same page so it is easy to read. It also has commentaries, encyclopedias, cross references, hebrew/greek word studies and if you have any international friends, at the top you can pick from like 50 languages. It has all sorts of cool stuff.
Enjoy!!!