Harry Harrison's Stainless Steel Rat series. Rollicking adventure stories, without excess attention to cohesiveness or anything other than fun. Good to see from a solid SF author. Also, every book after the first was written for the money.

Some novels I really enjoyed this year:

A Song of Fire and Ice. This is the series of books that the TV show Game of Thrones is based on. I read if for the second time this year and enjoyed it more than I did the first time.

The OreImo light novel translations by NanoDesu (online). This is a Japanese light novel series - a comedy about a teenage brother and sister with a love-hate relationship. If you like anime and manga, you might like it.

Wool by Hugh Howey and its prequel Shift. Wool is a dystopian science fiction novel set in an underground community (I mean, literally under the ground). I'm looking forward to reading the third book in the trilogy, Dust.

Little House in the Big Woods by Laura Ingalls Wilder and its sequel Little House on the Prairie. These are children's books about life on the frontier in North America in the late 19th Century (I think?). I found them very interesting in their portrait of what life was like for a mostly self-sufficient frontier family.

The Undomestic Goddess by Sophie Kinsella. This is a fluffy but entertaining British chick-lit comedy-romance about a high-powered financial lawyer who messes up big time at work, runs away, and becomes a maid to a middle-aged nouveau riche couple.