It's a terrific Catholic Bible translation, and a nice contrast to the more common (in both senses of the word) Evangelical offerings that saturate the market. I hadn't realised until now that it was freely available online, either to read on the Web or to download to your own computer.
Of course you don't have to be Catholic to appreciate it, though it probably helps. It may not be the NRSV, but it's kinda cool anyway. There are some really interesting features included, such as this diagram (click to enlarge) which you most certainly won't find in your NKJV, ESV or NIV!
The CCB originated as a Spanish Bible produced in Latin America by a French priest. The English version was later produced in the Philippines. Different! The version you can currently download is the 48th edition (which makes my hard copy of the 30th edition look a bit dated.)