I know there are several OLBs but in case you are not familiar with them I thought I would give you some resources.
From what I hear the biggest goto OLB is Bible Gateway. 9 time out of ten, if I type a scripture
reference in Google Bible Gateway the top hit.
Another favorite in Blue Letter Bible. This OLB is packed with content; study tools, devotionals, commentaries, and more.
A newer OLB to hit the web is called youversion. The cool thing about this OLB is that it is a sort of social networking Bible. You can contribute notes and share comments and a ton of other stuff too. They just released a mobile version this week so if you have a phone that links to the net of you have a pocket devise that has wifi you can have 14 version of the Bible in your pocket.
If you search "online Bibles" you will find several sites so check it out yourself and see which you like best.