Michael Wallace has just signed a five book publishing deal with Thomas & Mercer, the new publishing imprint from Amazon. He writes mystery/suspense and has been solely self-published until now.
Michael Sullivan has signed a five book deal with Orbit Books. He writes fantasy novels and has been solely self-published until now.
J. Carson Black just signed a book publishing deal with Thomas & Mercer. I don't recall how many books were in the deal, but I believe it was three. I believe she had been previously published but got dropped and then went into self-publishing. Now she's back in traditional publishing.
Of course, everyone has no doubt heard about Amanda Hocking's multi-million dollar deal to publish three new contemporary or urban fantasy novels. In addition, a couple of publishers tried to convince John Locke to sign with them, but he declined. Having sold over a million e-books on his own, I guess he didn't really feel the need to change anything.
There are several others that have done this recently, but these were the ones that immediately came to mind. I may add a couple more later.
Update: Scott Nicholson, another indie author, has just signed a two book deal with Thomas & Mercer. Scott writes primarily thrillers, and he does have a background in traditional publishing. However, he went indie and found success with a couple of his self-published books, and now he is back with a publisher.
Louise Voss shot to the top of the Kindle charts by self-publishing her book after being rejected by literary agents. It attracted the attention of publishers HarperFiction, which offered her a six-figure, four-book deal. As a result, her ebook Catch Your Death will also be printed and stocked in bookshops by a traditional publisher.
Jessica Meigs self-published two zombie novellas and was picked up by Permuted Press for a three book deal.
Last edit, I promise!
JA Konrath has been an openly outspoken proponent of self-publishing for some time. I knew that he had compiled a list at one time of self-published authors with no previous experience or exposure to traditional publishing. I'll let his list serve as a much better compilation of success stories.