When you publish your e-book, should you offer resell (or distribution) rights? Here's what I think:
I'd suggest not offering resell or re-distribution rights on e-books that you're using as an income stream. This was probably my single biggest mistake with my own first e-book, and one I won't make again.
Why would you want to avoid offering resell rights on a paid e-book? Because you lose value. You lose value, because all of the leads aren't directly coming through you - you lose site traffic (that can potentially turn into regular readers, customers, etc.), and you lose the potential to fully use your e-book sales for list-building.
If you really want to offer resell or redistribution rights for your paid e-book, at a bare minimum make sure the terms clearly state that it can't be edited (PLR e-books obviously wouldn't be included in this example), and that the buyers can't match or undercut your own prices (you shouldn't be competing with other people to sell your own product).
I learned the hard way that resell rights were a bad idea. If people want to make money selling your e-book(s), let them do it through an affiliate program instead.
Free e-books are a bit different... the whole idea is to get them to spread virally, so they work as a marketing tool for you. In order to do that, you have to give people the right to distribute it. In that case, you may want to offer only re-distribution rights for it to be given away for free, or you may want to let people sell it. It's up to you. Personally, I'd opt only to give re-distribution rights in a free sense, and probably wouldn't let people sell my free e-books. Again, you'll need to make sure that it's distributed with your name, links, and other credits in tact to get full marketing benefits, so don't forget to make that clear in the terms.
What are your thoughts on offering resell or re-distribution rights with e-books?