Virtual Nerd. What a great service! It is a virtual tutor for Pre-Algebra, Algebra 1, Algebra 2 and Beginning Physics. The cost is $49 per month, with other payment options available. To get a really good idea of what Virtual Nerd is, there is a 2 minute introductory video.
The target audience for this site is 7-12th grade. The site offers more than 1,000 tutorial videos explaining different math or science concepts. Each video is so well organized and the 'tutor' is very clear and easy to understand. The best part is their Dynamic Whiteboard, which allows you to see step by step, what the tutor is going over. If a step or process stumps you, you can click on that step or process for further instruction. I have never seen math explained so well before.
In Spring 2011, they will be adding a tool to allow students to do practice problems, take quizzes and receive feedback in return. They are also planning on expanding their subjects to include more Physics, Chemistry, Pre-Calculus and Calculus in the 2011-2012 school year with Biology to follow.
This is a service that I definitely plan on using for my kids as they enter High School in a few years. I don't have to know the answers to their questions, I just have to know where to find those answers. If there are concepts that you are having difficulty explaining to your child, you should really check this out. You can try it for $5 for 24 hours or free for 2 hours HERE.
*Disclaimer* I received this product free of charge in exchange for my review.