TimeAndDate.com's Calendar section and CalendarDate.com both have 2006 12-month U.S. calendars available as of 2015. Both sites offer Web versions as well as printable PDF versions.
TimeAndDate.com offers the option to search calendars for years all the way back to 0 CE. Calendars are available for many countries, highlighting different national holidays. Each month displays the moon phase change dates, and below there is a comprehensive list of all national holidays and their dates.
CalenderDate.com also includes information about the moon throughout the year, though it only offers the dates of full moons. Additionally, CalendarDate.com offers information about whether a given year was a leap year or not, which 2006 was not.