The biggest problem in the blogosphere among blogs devoted to science and education is that too many bloggers are only reading other blogs.
Unlike political blogs, current event blogs, and technology blogs, the bulk of the new information about science and education is not on blogs. It is in print journals, scientific conferences (that aren't streamed or open via other Web 2.0 technologies). (See my recent postings about BJ Fogg and online community participation.) So, if bloggers, students, and other interested parties want to keep current with current developments in science and education, they have to read the print literature.
An important contribution by bloggers to the advancement of science and education would be to summarize the print science online. We are still a long way from Science 2.0 and Learning 2.0. We won't make big advancements until more scientists and educators open their labs and classrooms with Web 2.0 technologies.