A List of the Simple Network Time Protocol Time Servers

A List of the Simple Network Time Protocol Time Servers That Are Available on the Internet

This is a KB article from Microsoft with a list of first and second level time servers. I synch with University of Delaware time servers because they are geographically desirable and only a few network hops away. They also have cool names after cartoon characters (huey, dewey, louie).

NIST has information on the NTP Protocol and setting your system clock, including instructions for all major OS's.