Here’s a spreadsheet containing dozens of professionals who do freelance work in the e-book production cycle, from cover illustration to copy editing and everything in between. I don’t remember how I found this, and I don’t know the woman who maintains it (her email address is at the top of the spreadsheet), and I can’t speak to the quality of any of the workers listed. But I’ve found it useful. If you’re looking for somebody to do some of this kind of work for you (as I have been), it’s a great starting point. Be sure to carefully vet anybody before you actually hire him or her, though — ask for references, especially, and talk to those references. Just looking at samples isn’t enough! You need to know how easy the person is to work with, how fast he/she turns around assignments, and so on.
And if you’re qualified to do this kind of work yourself, you should go add yourself to the list. Since it’s a public spreadsheet, you can do that, though the owners of the spreadsheet (not me) will have to approve any changes you make before they show up in public.