Social Science Data

Amidst my search for social science data (to perform social capital experiments), I have discovered the following data:

• Social Science Data on the Internet - seems to have lots of links to data, however the search is limited and results pages are clunky.
• Social capital datasets - presents some information on data sources that are specifically related to investigating social capital.
• INSNA - has the data used in Wasserman and Faust book on Social Network Analysis.
• ICIPSR - Inter-university consortium for political and social research
• SDA - web-based software available for accessing much of the social science data. Additionally, I noticed some archived data available.

There appears to be plenty of data.  Now on to the task of filtering it down to the most relevant...