here is an article on a book banned last year. not sure about the credibility of the source (posted on Angelfire, taken from NewsWithViews.com), but the story was given some attention - thus there should be other sources on this. link to the full article:
http://www.angelfire.com/az/sthurston/bannedbook.html
April 4, 2003
NewsWithViews.com
LAS VEGAS, NV -- Irwin Schiff is a well known author with over 500,000 books in print about the economy and the income tax. He is also now amongst the few who have had a book banned by the U.S. Government. On March 19, 2003, Federal Judge Lloyd George ordered Schiff to stop selling his book "The Federal Mafia" which has been in print for over 13 years. According to Schiff the Federal Government is using the American people's preoccupation with the war in Iraq as an opportunity to squelch freedom here at home.
Mr Schiff says, "The 1st Amendment is designed so people can have opinions different from the government and there is no legal basis whatsoever for banning my book. Its all contrived, it's bull***t. The government is banning the book because the information is accurate and correct."
With the exception of the Las Vegas Review Journal, there has been very limited press about this book banning. Mr. Schiff attributes this to the timing of the government's actions. He said,
"The reason there haven't been more articles is that the government banned the book the day the war broke out. A number of people have already told me they wanted to do material but because of the war they couldn't. For example, Alan Combs, of Hannity and Combs, said he couldn't believe they banned my book and that he would love to do something, but they were really pressed because of the war. I really believe the reason they issued their restraining order on the day they did was so the war would cover it up . If there was no war going on, this would be a major story throughout the country. Also, it's fear of an IRS audit that keeps the media in line to a large extent."