what's your favorite hammock book?

Summer is the best time for getting obsessed with a new (to you) book series, isn't it? I have fond memories of curling up with the first Harry Potter book when my parents got it for me for Christmas, but all the real marathons took place holed up somewhere with popsicles or iced tea.

Great summer obsessions of the past have included:

- the Wizard of OZ series
- Nancy Drew series
- Redwall (for like four consecutive summers, holla)
- Tortall (Alanna and Wild Magic series)
- Josephine Bonaparte series

Had I had a better library as a kid, I'm sure Terry Pratchett and Diana Wynne Jones would have been amazing for this. This summer so far I've been getting into some true crime (starting with The Bling Ring, natch). So what are/were yours? Are they worth checking out again?