At the bottom of this page on AskDavid.com there is some really good book promotion advice. One additional tip would offer authors is to add your book, where it's available, and a couple of lines about the story to your email signature.
I've added to all my accounts and it has led to some sales. People ask or reference it sometime
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"the courtroom scenes crackle....the setting and dialogue sing with pure authenticity." MenReadingBooks.com
Tampa Tribune:"this legal thriller is certainly hard to put down."
BookStory: "An edge of the seat legal battle. Unputdownable."
"I had a hard time putting it down."
"5 Stars Across the Board!"
"A cross between John Grisham and Tom Wolfe."
"Hard to Believe this is O'Leary's first novel."
R.C. O'Leary author of legal thriller Hallways in the Night.