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Fantastic source for news on medieval times, ranging from the dark ages to the Renaissance.

http://pred-ed.com/

Preditors and Editors is a list of different publishers, editors, agents, etcetc connected to writing, with warnings about the bad ones. It's an impressive collection of reviews and warnings, and they've been running over 15 years. If you're looking at a person or group connected to the writing world, but are unsure about how they perform, check this out.

Log lines and tag lines are not the same.

Need help with grammar, punctuation, structure, wording, or formatting? The grammar and usage tool kit on Writer's Relief likely has what you need.

8 cover design secrets publishers use to manipulate readers into buying books.

I would like to add a book recommendation to the list: Self-Editing for Fiction Writers. It's not a gigantic book, but it was written by two editors aiming to give writers an idea on how to improve their own works and make them more palatable. The first chapter is all about Showing versus Telling, and is probably one of the best resources I've seen that covers this.

Each chapter has exercises at the end, designed to help you pick out what is being done poorly, and asking you to attempt to correct it. It's a good read.

The amazon link for the book may be found here.