I love blogs that list viable writing markets and/or job opportunities. It's much easier to snap up a brief blog post in the morning than to read through a whole newsletter, and it makes every day seem like Christmas - what will I find in my stocking today?
Here are two of my favorites:
Writing for the Education Market by Laura Coulter - She posts frequently with markets, job leads, and other helpful information. You don't have to be a teacher to appreciate or make use of this information.
C. Hope Clark/FundsforWriters Blog by Hope Clark - Another frequent poster. Each post features a funding source for writers - contests, grants, fellowships and the like. I love how she prompts writers to think outside the box when it comes to funding (see March 1st post for an example).