I have discovered many other people have created science blogs or activities on teacherspayteachers. Here are a few that I have found.
http://scienceforkidsblog.blogspot.com/ This blog is for K-4. It is nice to find a science site that is for the little people. We like to explore science too.
http://prekandksharing.blogspot.com/ The prekandk site has great ideas for many different subjects. I love the hands on/exploring science ideas and the montessori activities they have.
What blogs have you found for science?