Yahoo! has begun to send out authorization codes to people who have signed up to try out Yahoo! for Teachers, "a place for educators to find, create, and share standards-based classroom materials". YFT makes use of a tool, called "Gobbler", that you download and install locally, and which you can use to "gather images, text clippings, and web pages from the Web into projects in your portfolio", from which "you can create documents to use in your classroom", and which you can (or have to?) make publicly available for others to use. The term "standards-based" caught my eye, but when I searched within YFT for it, I could find no references to it.
At the moment i) the content available is overwhelmingly focused on the US school curriculum and ii) you need a Yahoo!-issued username and password to access the service. You can sign up for an invitation on the Yahoo! site. This Google blog-search will give you an insight (of sorts) into current reactions to YFT.