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Some texty info about simple machines - provides some good written definitions (with some other links)

List of websites that might be useful for learning about simple machines

GREAT series of interactive websites on simple machines (goes into some technical detail too)

GREAT series of interactive websites on simple machines (goes into some technical detail too)

Interactive site on simple and compound machines (It lists "gears" as a simple machine, which is the only place where I have seen this, as everywhere else just has the traditional 6 simple machines. Likewise, some of the examples of various machines are a bit tenuous, but it is a fun site, nonetheless)

Some interactive activities and info

Some basic info and interactive activities about simple machines