[New information added at end of post. 8/26/07, 10:10 PM]
Apparently KRDO consumer affairs reporter Tak Landrock has been in ongoing contact with Ted Haggard, and he believed the letter (see my earlier post) was genuine enough to go with the story. And so did experienced reporters at the Colorado Springs Gazette and the Associated Press. (AP religion editor Eric Gorski used to write for the Gazette and was the Denver Post reporter who covered the Haggard scandal as it broke last November. Eric should be close enough to the story to have reliable intuitions.)
Nevertheless, some people posting comments at Colorado Confidential are questioning the letter's authenticity.
The Zip Code for the alternate address in Scottsdale is not an Arizona Zip Code–although a 9 is just one key away from an 8. And the ages of Ted's children don't exactly match the ages another reader calculated based on information in the Wikipedia article on Ted–but then Wikipedia is not always the most reliable source and ...1