Okay, so to get started, here are a couple of books I found very helpful when I first started out:How Not to Write a Novel
by Mittlemark and Newman
This book is worth reading for its entertainment value alone. Clear, understandable advice is delivered in concise chunks, with highly amusing examples. I've found the way each snippet of advice (of which there are 200) is given a short, memorable title has made it easy to remember and recall.Self Editing for Fiction Writers
by Browne and King
This one is a lot more serious but I guarantee you it will help you improve your writing. It isn't just the quality of the explanations but the detail in the examples which makes this book so clear in its message. It does get a bit heavy handed with its rules in places, but so long as you don't rely on getting all your information from one place you should be able to pick out what works best for you.
And one blog post which sums up a topic with a lot of conflicting advice in a very succinct and witty way...Dialogue
by Tony Nolan (a guest blog post on The Feckless Goblin
A whole heap of advice on dialogue mechanics and content in a short blog post. Check out the rest of the posts on the blog for more on Horror and Dark Fiction.
Right, that's all for today, I'll dig up some more to add soon.