This spring you can try our sample module on the Atlanta Olympics. It has geography and history, math and science, even poetry. These modules are excellent. Visit and test the free Olympics module. They are a model for integrated curriculum pages.
Details are available at the site.
While the quality of the Internet experience provided by such modules is very high, the pricing puts them considerably above the cost of textbooks which may last for 5-10 years. CCC is known as a publisher of curriculum-based educational software. Now they are moving seriously into Web curriculum. A sample from their menu . . . Gallery home to CCC projects past and present.