i have not been able to find what constitutes acceptable id on the tsa website. i did bungle onto this, dated 02/06/08, which is for their "enrollment process"
http://www.tsa.gov/assets/pdf/approv...ation_docs.pdf
does that work for getting on the plane. it would be nice to be carrying some expendable documents in one's carry-on if one's drivers license is disappeared.