TES Australia is a great resource and community for teachers. The teaching units provided contain useful and practical content and activities. The community section provides opportunities for those interested in collaborating with other teachers.
The MHMS Daring School Library Blog is often mentioned as a leading blog in the provision of library services. The Daring Librarian has won awards for her blog and following her on twitter (@GwynethJones) is valuable for any Teacher-Librarian's PLN
splash.abc.net.au is a great learning space for teachers - it is easy to navigate, the information they provide is relevant and their "push technologies" forward useful information just in time for curriculum needs.