Check the phase of the Moon right now!
Click here for a Lunar Calendar.
Click here for the NASA Eclipse Page.
There are many diagrams and animated graphics of the lunar phase cycle on the web. Use your fovorite search engine to find more. Here are a few that I liked:
JAVA lunar phases at the University of Wisconsin
The Moon at Enchantedlearning.com
Here's a nice page at the University of Maryland
Here's a nice graphic on spring and neap tides from the Australian Cooperative Research Centre for Renewable Energy (home page at http://acre.murdoch.edu.au)