I stick basically to two series right now, written by the same team of writers. I have read all of the Deathlands series up to the current book, and only missed three of The Outlanders series because it was a three-part mini-series in the line, and my brother misplaced the second book where apparently everything interesting happened.
My dad and older brother both read the books when they started years ago, and I picked up a book about four or five years ago and quickly bypassed my brother... he's still a good three years behind me for both series. However, since dad died over three years ago, I've been keeping up reading out of a tradition as he made a good friend over at the local bookstore that is glad to see that I'm taking after him. The books aren't horribly long, around 310 pages a piece (used to be 345, stupid economy), and I can get through one in about three days. Sucks that it takes them around 2-3 months to publish a new book in either series. Outside of that, I only suffer reading what is left in the bathroom (usually magazines or catalogs) when I'm taking a call in the office.