We've begun work on a prehistory time line so that we have a visual aid for reviewing the information we've learned so far in our studies. I scoured the internet looking for ideas and found very little. It seems that most homeschoolers teach from a creationist perspective and I was looking for an evolutionary perspective. I finally found what I was looking for at funschooling.net. Combining that with pictures from Nova's The Missing Link: A Brief History of Life gave us the base for our timeline.
Pictures of our time line are coming soon.
I'm thinking about rounding out our studies with a recipe from the free online Geologic and Paleontologic Cookbook from Kentucky Geological Survey.
Other links you might find useful:
Satori Smiles (blog) Prehistory post
National Geographic Prehistoric Time Line: Rise of Life