Kindle, Smashwords and out of print books

I have a few books that have fallen out of print in the past several years. They were written some time ago and need re-writing, re-editing and maybe a sexier cover or two. One of them has a sequel in the works.

I've published one on Smashwords, the infamous "Of the Clan O'Grady" which was originally published with Changeling Press. I have two sequels just malingering on my hard drive here. I wonder if I should publish them as Kindle books at reduced prices.

Would it be wise to publish them on Smashwords AND as Kindle on Amazon? Or is there some legal deal with that? After all, I am the publisher in both cases, am I not.

It would be satisfying to see them up and available again. In a sort of non-financial spiritual way.

But I wonder if it would be worth (now I'm talking $$$$) the considerable time it would take to dust them off, fix them up and format them.

Any opinions or requests will be duly noted and considered.