Statistical Resources on the Web (Univ. of Michigan)
This very wide ranging listing describes where a multitude of data sets can be found on the Internet. While there is little additional economic data beyond what is covered here, there is a wealth of other data -- everything from agriculture to weather (24 categories in all). In addition, instead of listing data by sites (which can be quite vast and hard to navigate), the data here is listed by category. This often makes the data easier to find.
http://www.lib.umich.edu/govdocs/stats.html