For a more recent affirmation (from front page of USPTO.gov but you have to toggle through the "what news" screens to find it) see
http://www.uspto.gov/patents/law/notices/uspto_closed_20100208.pdfIn view of the official closing of the Federal government offices in the Washington, D.C. metropolitan area, including the United States Patent and Trademark Office (USPTO), on Monday, February 8, 2010, the USPTO will consider Monday, February 8, 2010, to be a “Federal holiday within the District of Columbia” under 35 U.S.C. § 21(b) and 37 C.F.R. §§ 1.6, 1.7, 1.9, 2.2(d),
2.195 and 2.196. Any action or fee due on Monday, February 8, 2010 (or the preceding Saturday (February 6, 2010) or Sunday (February 7, 2010)) will be considered as timely for the purposes of, e.g., 15 U.S.C. §§ 1051(b), 1058, 1059, 1062(b), 1063, 1064, 1126(d), or 35 U.S.C. §§ 119, 120, 133 and 151, if the action is taken, or the fee paid, on the next succeeding business day on which the USPTO is open. 37 C.F.R. §§ 1.7(a) and 2.196.