An interesting article from the NY Times on typos in published work. Click here for the article.
If you’re unsure about the ‘appropriate’ length of your book, check out Chuck Sambuchino’s article. This applies only to print books, of course. For ebooks, you’re on your own. Click here for details.
People on the Novels group of the Internet Writing Workshop are most likely sick of my obsession with genres :-), but it is really important to know which slot your book fits in. Agent Query has a great article on this, and they also list more resources. Well worth the time to check it out. Click here for details.