A couple of good links on marketing
Why yes, I do plan on working today. But first!
This is a neat post from Kristine Kathryn Rusch about why you should focus on writing instead of getting all caught up in marketing to the detriment of actually producing books.
And
This is a good post by Camille LaGuire (found via PV comments--seriously, read those things, they go off on the most interesting and useful tangents) about how Google ranks things and why you should really not run about spamming blogs.
I realize both these bits of advice happen to coincide with my own prejudices, but I still maintain that if someone's marketing advice makes you want to shoot yourself in the head, then don't follow it, because ultimately it will make you less eager to finish your book.