'Teaching' sites I've found interesting

Astronomy

Astronomy Picture of the Day

Bad Astronomy blog

Solar Storm Watch

The Globe Program

Astronomy Education

Astronomy Education Review (journal)

Scale Web Page of the Solar System (amazing!)

Astronomy resources are here for downloading

Moon Phases slide show (right-click and save as)

African Starlore

Gravity Slide Show

Scale Slide Show

Biotechnology

Public Understanding of Biotechnology (a division of SAASTA in South Africa)