The following page lists a variety of blogs put together by science educators and communicators:

Marc West - Australian Podcaster resides in the UK - http://misterscience.blogspot.com/
Dr Karl's - Famous Science Communicator (AUS) - http://drkarl.wordpress.com/2007/11/06/dr-karl-clean-coal-update/
John Pearce - Active Primary Science ICTer (AUS) - http://simply-science.blogspot.com/
Suzie Vesper - ICT facilitator - Primary Science Teacher (NZ) - http://petoneforeshore.blogspot.com/

Nick Johnstone - Blogs in Biology