That's a great question! I'm a writing book addict myself, and I'll have to check out Zissner's. There are a few books I've read and loved, depending on what you're looking for...
Ann Lamont's BIRD BY BIRD is a very motivating (and funny) book about writing. Stephen King's ON WRITING is a classic tome written by a successful author as well.
To identify potential issues in your writing, I like SORRY, BUT THIS ISN'T FOR US by Jessica Page Morrell. She's an editor by trade, so if you can't send your book out to be edited (which is not something I'm ready to spring for!) she can be very helpful in identifying the weaknesses in your writing and improving them.
And I really like the Writer's Digest Write Great Fiction series - if there's an area that you want to focus on, they have a book specifically on plot, characters, dialogue, setting, etc. I l struggle with plotting, so I read PLOT & STRUCTURE and found that very helpful.
Those are a few books on my shelf, although I'm contantly looking to learn new things to help myself grow as a writer.
