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.

Science Friday is a live news/talk show about science that is broadcast every Friday on National Public Radio (NPR) stations nationwide. NPR has made new video-based science lessons available to complement the show free of charge on their Web site.

From the Kentucky Virtual Library, this site is a special research portal and information literacy tutorial designed for grades K-5. Through its interactive gameboard format, the site takes students through the entire process of research from picking a topic through a self-evaluation rubric for the project. Great site!

ASL University is an online curriculum resource for American Sign Language students, instructors, interpreters, and parents of deaf children.

Although the entire site isn't free, there are several free video lessons on Educator.com to get you started with high school science and math courses.

Brightstorm Math uses online video to comprehensively cover the topics found in major textbooks, state frameworks and NCTM standards: Algebra 1, Geometry, Algebra 2 and Precalculus (Calculus coming soon!). The site contains over 1,800 engaging online videos with clear and concise concept explanations and sample problems.

Biz KID$ is a series where kids teach kids about money and business and is just about the perfect maturity level for my 11 year old daughter. Each episode focuses on one aspect of business and money management such as credit, the art of negotiation, wise spending, budgeting, and more.

Deana of The Frugal Homeschooling Mom wrote to me about a giveaway she is doing, and when I checked it out I discovered a treasure of freebies, great deals, frugal living ideas, and more on her site.

Monster Exchange is designed to encourage the development of reading and writing skills while integrating Internet technology into the classroom curriculum. Classrooms from a variety of schools worldwide are paired together; the students in each classroom are split into groups, each of which designs an original picture of a monster. The students must then write a description of the monster. The partnered classes then exchange their descriptions via e-mail and the Internet. These students are then challenged to use reading comprehension skills to read the descriptions and translate them into a monster picture. The true challenge involves creating a redrawn picture as close to the original picture as possible without looking at the original and using only the written description of the monster.

Scratch is designed to help young people (ages 8 and up) develop 21st century learning skills. As they create and share Scratch projects, young people learn important mathematical and computational ideas, while also learning to think creatively, reason systematically, and work collaboratively.