From Bookmachine, a useful checklist of must-do items for authors looking to enhance their digital presence:

* A robust author website to anchor an author’s complete digital presence and act as the central hub and source of authoritative information on everything about the author, her books, her work, and life

* Complete author and book information at book cataloging and community sites like Goodreads and LibraryThing, as well as at all online retailers (especially an Amazon Author Central page)

* Google+ to signal to Google who an author is, what she writes about, and all of the things connected to her

* The right social media mix, which can vary — and evolve — depending on the author, the type of books she writes, and the interests and demographics of her audiences

* Mechanisms to collect, manage, and effectively use email addresses

* Ongoing efforts to maintain accuracy and relevance across all of these

* Effective cross-promotion (across titles and authors)