Seterra is a challenging educational geography program with 70 different exercises. Learn about countries, capitals, flags and cities in Africa, Europe, South America, North America, Asia and Australia, using outline map exercises. The software keeps track of scores, making it fun to try to improve each time you play. Windows only.

I am not a big fan of structured curriculum, preferring instead thought-provoking tools for children to use at their own pace. This list of Things to Buy Instead of Curriculum is a great list of ways to invest your money that will pay dividends in your children's love of learning.

Each lesson has a brief introduction and numerous examples with detailed explanations. The are plenty of examples to help explain the concepts for each lesson which are followed by several practice problems. The site is well-designed and has a user-friendly interface.

T8ermomma, owner of Shiver Academy (Shiver is a penguin who is the school mascot, in case you are wondering), has put together a 992 page unit study based on the Book of Virtues and has made it available for download at no charge. This enormous resource is full of printables, lesson plans, worksheets, planning sheets and much more. It's obvious that many hours went into planning this great unit and T8ermomma is gracious enough to share it at no charge. You can see all of the details at her blog, and look in the right column about halfway down the page for the download links (under the Book of Virtues heading). There are a few other downloads available below the Book of Virtues section. The unit is available as both one large file and several smaller files for those who might be on a slow connection. Thanks to Homeschooler's Notebook for bringing this resource to my attention!

NASA has put together a commemorative Apollo mission section of their site to celebrate the 40th anniversary of the lunar landing of Apollo 11.