You guys seem to like "free, printable activities," and I have another one for you:
Remember that moon-gazing activity for young students I posted a few months back? Here is another version of the same activity. Ology provides a printable flip book for students to record and illustrate their observations about moon phases for one month. It's a pretty simple activity, and attention to detail will result in a nice, handy depiction of how the moon changes over the course of one month. There is also room in the flip book for make comments and notes about what they see.