Teaching Tolerance no longer hosts the TDSi site. Most of the resources, however, have been moved to a new site maintained by UCEA at the University of Virginia.
You can find these at the Educational Leadership Development Library housed at http://curry.virginia.edu/fipselibrary/.
We do still have a full text version of the Common Beliefs Survey at http://www.tolerance.org/supplement/mythtakes-working-racially-and-ethnically-diverse-students.
If you need help finding a specific resource, we might be able to help. We do have PDF versions of some TDSi resources available in our archives.
Please feel free to contact us as necessary.