Well, I don't know if someone already posted it or not, but its still a fun letter regardless.
In response to a person who inquired about this [the exclusion of “Jehovah” from the NIV], Edwin H. Palmer, Th.D., Executive Secretary for the NIV's committee wrote:
"Here is why we did not: You are right that Jehovah is a distinctive name for God and ideally we should have used it. But we put 2 1/4 million dollars into this translation and a sure way of throwing that down the drain is to translate, for example, Psalm 23 as, 'Yahweh is my shepherd.' Immediately, we would have translated for nothing. Nobody would have used it. Oh, maybe you and a handful [of] others. But a Christian has to be also wise and practical. We are the victims of 350 years of the King James tradition. It is far better to get two million to read it - that is how many have bought it to day - and to follow the King James, than to have two thousand buy it and have the correct translation of Yahweh...It was a hard decision, and many of our translators agree with you."
lol oops, he was a little too open wasn't he? ;)
So for your question:
"Why does Christendom remove Gods name Jehovah from their bibles?"
The answers are mainly:
1. Money
2. Tradition
Extra:
Why we really do know how to pronounce God's name and why it does not involve 14th century monks in any way whatsoever (strawman anyone?)
http://divinenamepics.xanga.com/655741828/item/
Book by Dr. Firpo Carr, who spend 14 years of his life researching the God's name:
http://www.amazon.com/Search-Sacred-Name-Firpo-Carr/dp/0963129333
And a site for those who blaspheme God's name by associating it with the words "mischief" and "ruin":
http://web.archive.org/web/20040205193855/hector3000.future.easyspace.com/jehovah.htm
Oh and just for even more fun, here is a 65 page essay by Howard Mazzaferro explaining why Jorge above is 100% wrong:
http://www.quotedstatements.com/thelordandthetetragrammaton.pdf
Aga'pe