This may be a little late, but besides the US rule book, US SAILING also publishes:

• "Sailors Guide to the Racing rules" - a 20-page illustrated booklet that briefly covers the rules,
• "The Rules in Brief" - a two sided laminated card summarizing the rules for when boats meet, and
• "Race Signals" - a sticker that shows the various flags used for race signaling and their meanings.

These items (and more) are available at http://store.ussailing.org/browse.cfm/racing-rules/2,8.html

I hope that helps,
Eric