I posted this the morning at my online writer's club, so thought it would be appropriate here as well!
Regardless of your publishing path, it is imperative that you have a professional book editor proof your work.
You are too close to your own work to do the final edit and only a professional editor knows the rules and standards of the industry. Your work will stand out among the masses of submissions if it has been properly edited. Skip this step and you take your chances in the slush pile!
This article highlights the importance of and editor: http://www.writersreaders.com/blog.php?thebid=129
And these two sites boast lists of available editors:http://www.parapublishing.com/sites/para/resources/supplier.cfm - Dan Poynter’s Editor List
http://www.the-efa.org/dir/search.php - Membership directory of the Editorial Freelancers Association
Your writing represents YOU! Put your best foot forward.