leap year

• Royal Observatory Greenwich leaflet: 'Leap years'

Yes, AD 2000 is a leap year :

• Royal Observatory Greenwich leaflet: 'The Year AD 2000'
• DEC Answers Leap Year Complaint
• The British Calendar Act of 1751 explicitly states AD 2000 shall be a leap year:
  II. And for the continuing and preserving the Calendar or Method of Reckoning, and computing the Days of the Year in the same regular Course, as near as may be, in all Times coming; Be it further enacted by the Authority aforesaid, That the several Years of our Lord, 1800, 1900, 2100, 2200, 2300, or any other hundredth Years of our Lord, which shall happen in Time to come, except only every fourth hundredth [sic] Year of our Lord, whereof the Year of our Lord 2000 shall be the first, shall not be esteemed or taken to be Bissextile or Leap Years, but shall be taken to be common Years, consisting of 365 Days, and no more;