I decided recently that I need to be reading in the field that I plan to work in. I have been doing this, for school, research, and pleasure, but usually with books and papers I picked up for specific points. I follow Derek Lowe's blog with pleasure, and have for years, but it's unlikely I'll go into that field of chemistry. There are of course the professional journals, but those aren't accessible to those who can't afford (or justify) the investment in a subscription.
Since Lowe's blog is now syndicated by it, Science is a webzine that I will start exploring more of.
More specific to the fields I'm interested in:
Strange Remains: a blog of archaeology and anthropology, with a focus on bones. Where else can I find articles about John Paul Jones' mummy? Or the exhumation and forensic identification of Betsy Ross?
Another forensic anthropology blog is Forensic Anna, written by a UK researcher. Photos are not for the squeamish.
More for the living is the forensic psychology blog of Karen Franklin. It doesn't update often but there is good stuff here.
I don't know about the general usefulness of this blog, but if you've ever wondered about the accuracy of the TV show Bones, this is the place for you.
Ever wondered about experts in court? This blog covers who can testify about what, reporting on decisions that apply to the Daubert rules.
And The Poison Review is just what it sounds like, covering what is, and isn't, toxic.
HistoQuarterly presents lovely images of tissues and very nicely presented articles on specific topics. I'm looking forward to diving into their archives.
The Forensic Magazine presents articles on cases, evidence, and equipment.
Forensic Research is an open-source scholarly publication
The Open Access Journal of Forensic Psychology is just what it says it is.
The National Forensics Association makes an archive of their journal available to the public, which might be useful for researching writers.
The Cell is a resource for molecular biology articles.
And now that I have given you plenty to look at, should your interests run that way, I'm off to do some writing.