Here's a link to an article in this morning's SF Gate (and Chronicle). Barbieri has revealed that he has Parkinson's disease.
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/10/05/SPT01LDDVS.DTL
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/10/05/SPT01LDDVS.DTL