The Holy Bible Online

BibleGateway.com is a website designed to allow easy searching of the Christian Bible in many different versions and translations, including Spanish, French, and other non-English languages.  http://www.biblegateway.com/
 
The Blue Letter Bible site has a fairly comprehensive list of study tools including encyclopedias and dictionaries as well as searchable Bibles. 
 
The Net Bible is a heavily foot-noted study bible with links to scholarly articles, historical and archeological information.  http://net.bible.org/bible.php