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Microsoft's Education Labs launched a new project this afternoon and it's better on trees and the environment. The group just announced a new Math Worksheet Generator where teachers can generate math problems and email them in paperless Word format to their students. In addition to Math Worksheet Generator, the group also announced plans for two additional projects to be released in the Fall.

While the down economy continues to hurt funding to our schools, more and more teachers are looking to web-based services to help educate their students. Whether it's through open resource projects like CK-12, virtual classrooms like those in Second Life, or through the repurposing of tools like Twitter, millions of teachers are finding innovative resources to engage their students. If you're a teacher, here are seven great tools to get you started.