Nature has launched an aggregator of science weblogs called 
Scintilla. Scintilla collects data from hundreds of news 
outlets, scientific blogs, journals and databases. It helps 
users keep track of life science podcasts, or the latest 
papers on schizophrenia, DNA methylation or immunology. You 
can rate items and recommend them to colleagues. Sources 
are manually selected, and only related to science, so 
there shouldn't be any trouble with spam.  Browse the site, 
add sources to your collection, and visit your 'Read' page 
on Scintilla whenever you're looking for some juicy science 
stories to read.