This GSS panel dataset has three waves of interviews:
This data file contains those 2,000 respondents who were randomly selected from among the 2006 respondents to participate in the panel. And the data file contains those variables that were asked at least twice in three waves.
This SDA site for the GSS Panel Dataset is set up to facilitate data analysis and subsetting. It does not contain all of the available documentation on the GSS. See the NORC GSS documentation page for links to all the available documentation. More specifically, see the Release Notes for the GSS Panel.