If you are interested in downloading bible software, you can download Strong's Concordance and several versions of Scripture, including versions in Greek, Latin, and Hebrew (OT) from this site (Thanks, Amy!)
Good bibles are available online as well. Blue Letter Bible is a neat site with a number of features of interest to those on the scholarly side. In addition to bible texts in Greek, Latin, or Hebrew, including Septuagint, it's got cross-references, (Protestant) commentary and dictionary, side-by-side translation comparison, even grammatical information on the original languages and a hymn concordance (which (Protestant) hymns invoke which scriptures). It's pretty neat, although it is all from a Protestant perspective — no Catholic translations (although the RSV is available and that's pretty acceptable).
If you want an online copy of the NAB, the USCCB has a comparatively lame site with it (searching and navigation are awkward). Also it has Catholic commentary (though I suspect it's the commentary I'm not a big fan of).
