See below in searchable databases for the Toxic Release Inventory. Statistics Tons of crime-related numbers from the gods of crime statistics. Also chck their tables used in BJS reports for more data. National Archive of Criminal Justice Data National Archive of Criminal Justice Data which is affiliated with the Bureau of Justice Statistics. Don't try to use this data on deadline.
Site generally sucks.
The IRS Statistics of Income program tracks all sorts of data but always in summary form. All are downloadble often in spreadsheet form. Some databases are VERY big and the site is VERY slow. Federal Railroad Administration Accident Data Gone is the old gopher site but this web page still lets you download files in DBF format. Includes good record layouts.