BEA site contains many statistics - national, regional, international, industry - as well as the Survey of Current Business (articles and tables). New feature - chart "Which agency produces what statistics?", at: http://www.bea.gov/newsroom/matrix.htm - for BEA, BLS, Census
"TRID covers all modes and disciplines of transportation and contains more than 900,000 citations of published research" Focus is on books, technical reports, and conference proceedings. Over 64,000 records contain links to full-text documents.
ProQuest Statistical Insight database is the most comprehensive source of federal statistics (since the early 1960's). But, mostly pdfs. The database also provides access to American Statistics Index (ASI), Statistical Reference Index (SRI), and Index to International Statistics (IIS).