This Google Earth KMZ file (500 k) contains nearly 20,000 census tract centroids, representing all census tracts with an estimated 50 or more Latinos of voting age who are citizens as of July, 2006.

The tracts are sorted by state, county, and place. For faster load time, Google Earth initially displays California only. Click on the sidebar boxes to display additional states.

Use the gCensus web form found here to obtain tract boundaries in KMZ format for your areas of interest.

This file appears to load in Google Maps, but is too large to display properly. Many of the points do not display even when zoomed to street level.

Additional details here:

http://www.fairvote2020.org/2006/12/est-latino-18-citizens-2006-by-tract.html