Music Theory
Music theory.net: Simple and Compound Meter
Examples of simple and compound meters, as well as explanations of the terms duple, triple, and quadruple. Plenty of illustrations accompany this terrific resource. By MusicTheory.net.
Music Theory
Music theory.net: Odd Meter
This site gives a brief definition of an odd meter. Use the arrows at the bottom to navigate. Provides illustrations and a printable chart.
Other
Music Concepts Online: Meter
This website covers information taken from a lecture on meter. Also includes FAQs that you can view by clicking on the provided links. You can learn about the different types of meter, how it is counted, and view examples.