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I got to www.gnooks.com There is a section titled Gnod.. you type in 3 of your favorite authors and they give you a recommendation of a new author.
www.fantasticfiction works well for me. I type in my favorite authors and see what they recommend and what they are reading.
www.stopyourekillingme.com has a lot of "If you like" sections and have so many authors listed it's hard to get through them all!