I have seen a few news items mentioning that applying for the ESTA to enter the U.S. will not be free for much longer.
Found this link that might be of interest:
http://www.cbp.gov/xp/cgov/newsroom/news_releases/national/08062010_2.xml
Found this link that might be of interest:
http://www.cbp.gov/xp/cgov/newsroom/news_releases/national/08062010_2.xml