According to the latest report of the American Customer Satisfaction Index e-gov survey, "Customer satisfaction with federal Web sites dipped slightly last quarter for the first time in a year, although users are generally more satisfied with the information the government has online." (Reported in Government Computer News, March 21, 2006.)
Apparently, the USPTO is no longer participating in the ACSI e-gov survey, as it doesn't appear among the Q1 scores. It was first included two years ago in the March 2004 ACSI report. ACSI scores are archived at http://www.theacsi.org/government.htm.