For researching all of those tip-of-the-tongue-can't-quite-remember spells, the coolest place I found was MuggleNet
. It's the cream of the crop as Harry Potter fan sites go. Their spells section
is extensive and gives a description of each spell.
Some sample spells:
Also, I made an action called "Marauder's Map" which is activated by saying "I solemnly swear I am up to no good." which opens the browser to the home page.