This list is by no means exhaustive, but hopefully is a good place for new Econ teachers to start. If I've missed out any useful references or if new ones have come along, do let me know and I'll pop them on.
Resources - printed and digital, paid and free
A-Z Business Training
Blogs (for teachers)
Blogs (for students)
Talks (for teachers)
Talks (for students)
Business and Economics Teachers (run by iXL tutors)
IB Economics Teachers' Group (by Marc Burnell)
For A-Level Economists (run by Bus_Omics)
Economics teachers and departments to follow on Twitter - if you'd like to be added/removed, please just let me know!