http://biz.yahoo.com/c/e.html is a pretty decent calendar also. If you click on the economic indicator, they list a brief overview of it's importance. Could be good reference.
Here's my favorite economic events calendar: http://www.cboe.com/Framed/Frame.asp?TARGET=http://cboe.ccbn.com/highlight.asp?client=cboe&SECTION=5
That is a good calendar. They even list the correct time for the Phila Fed which theStreet.com does not do nor many other calendars.
Philly Fed is known to the Bond Market as a 'second tier' release in terms of importance that has a reputation for wild swings. The Chicago Fed is a more reliable and meaningful Fed release in terms of a wider and more robust cross-section of manufacturing and service industry performance.