When I was a dub I totally believed, without every checking, that all 237 times Jehovah was used in the NT were direct quotes from the OT. I accepted that the original writers would have copied the text correctly. Once I faded and found out the truth about the insertion of Jehovah in the NT I was blown away.
It was as if the WTS sunk to a new low for me and I couldn't believe it. I knew they were wrong doctrinally but to be dishonest - that was a new low which by now I realize they regularly sink to.
Jeff Schwemm had a thread on this some time ago with some really great info. I couldn't find it but maybe somebody (or js) could.
Here is a website I've used for research: http://www.europa.com/~lynnlund/