I got 15. I don't think I used any particular strategies; the reason your verbal score is so hard to change is that it's really a talent that develops long-term from reading a lot. Reading a variety of things is very useful.
I read a lot of crap (think Anne Rice and Cosmo magazine), which is actually not bad because it at least keeps me used to reading, and keeps my speed up (I finished the section way before time). But I also read magazines like the New Yorker or the Atlantic, pop-science books (I love Carl Sagan), and decent novels, and that sort of thing is definitely more useful.
Practice reading with an eye to analyzing the arguments - flip through your New Yorker, pick an essay on a somewhat controversial topic, and look for the assumptions, logical flaws, arrangement of the argument.
There tend to be passages from the natural sciences, social sciences, arts, and humanities. You should practice reading about each of those, obviously focusing on whatever's harder for you. You don't need to be reading scientific papers; the MCAT passages are at the level of pop-science books you find at the bookstore. Actually, on my MCAT one of the passages was out of a book I read, loved, and discussed with my friends - that was a lucky break, but just doing reading and discussion on any topic is a big help.
I think (but don't know from experience) that finding someone who's good in verbal to help you practice could be really helpful. They can show you how their thought process goes when scanning the passage for answers - reading the explanations in the review books is helpful but not the same.
The strategies people mentioned: come back to impossible questions, try to think of the answer before you read the choices, don't read the passage as carefully as if you had to memorize it, are all good.
Edit: one strategy I did use. In the back of the booklet, it gives attributions for the passages. This can be very helpful for those questions that ask about the author's biases - I remember one practice exam had a passage put out by a marketing association, which made the bias pretty darn clear.