Using the web archive, I was able to find the last known (cached) versions of websites that have either lapsed, or were 'taken down' by you-know-who.
exempt W4
http://web.archive.org/web/200104190....exemptw4.com/
taxgate
http://web.archive.org/web/200303300...//taxgate.com/
inform america
http://web.archive.org/web/200211230...rmamerica.com/
NITE
http://web.archive.org/web/200211230...rmamerica.com/
Keep in mind that some of this information and research would be considered out of date. This is for information purposes only.