I had a flick through Writing Down The Bones, and eventually elected not to buy it because she said something particularly daft about "real" writers writing in the rain. Which is just nonsensical because your nice notebook will be destroyed, your ink will run and you could catch a chill. I'm all for melodrama but this seemed needlessly melodramatic to me, so I sniffed and set her back on the shelf.

I have two books on their way at the moment, "A Writer's Book of Days" which is more inspirational than technically useful, but that's what I wanted really, and Strunk and White for the technical side.

On my shelf I have:
the Gotham Writers' Workshop guide to Writing Fiction which I haven't dug through enough to know the value of yet,
Fondling Your Muse which is more the sort of thing to vent your frustrations with you,
In a Word, which is indispensable when you're looking for exactly the right word to describe your protagonist, or that one moment in a scene, and it's on the tip of your tongue but you just can't remember it.... yeah. Is good.
...and Juicy Writing, which is aimed at the young people but is actually quite good for the odd prompt, journalling ideas, story starters and so on. I don't use it much, but I like having it around, and there's quite a bit in there.