I've updated the links in the sidebar, cutting out a few which were dead, moving some into categories which seemed more appropriate (the categories are just a guideline -- many of the sites don't fit comfortably into one category only). There are some great blogs I just discovered and added.
One link I didn't add, because it isn't related to speculative fiction particularly, but which I've enjoyed very much, is the Missouri Review blog. It's interesting to see behind the scenes of a mainstream lit magazine, and provides some wonderful links, for instance these writing exercises. The blog is young, and I look forward to seeing what the various writers will come up with. Unlike some blogs connected to major publications, this one allows the writers to be personal, giving us a sense of the personalities working on a respected literary journal, while at the same time providing good information about publishers and writers.