Sometimes I'll read the reviews and sometimes I won't. Sometimes they influence me and sometimes they don't. Other times its word of mouth, opinions from friends. I do refer to Litkicks quiet a bit. I also have a wish list of authors I'd like to read. I tend to start on an author and read their full list of works. Sometimes though, I'll walk into a book shop have a look around. If somethine grabs my attention, could be the title, could be the cover. I'll read the list contents then maybe the first page and if I like how it 'feels' I'll buy it.
I never read best sellers lists, I don't spin in that orbit.