Reaper Man and Mort, (both A/YA) and both by Terry Pratchett. I am constantly re-reading Pratchett's Discworld novels and trying to figure out a way to use one or more of them in class with the seventh graders. For the moment I am striving to be content with having two (The Wee Free Men and A Hat Full of Sky) on the summer reading list. Both of these are books about Death, one of my favorite Discworld characters. Death always speaks in capital letters and his granddaughter, Susan Sto Helit is another of my favorites. You can find her in Soul Music and Hogfather, as well as Thief of Time.
World War Z, by Max Brooks (MYA) is an oral history of the zombie plague that nearly wiped out humanity. It's written in the style of The Hot Zone, by Richard Preston (a true and fairly gruesome story of the Ebola virus that I loved, but would recommend for more mature readers only because it does get pretty graphic and did I mention gruesome?). World War Z is a little less graphic, but still fascinating.
Taken, by Edward Bloor (YA) is a book I'm thinking about putting on the dystopia list for the fall, so I won't say much more about it here, except to comment that it is pretty typical Bloor (who also wrote Tangerine). In other words, expect a twist at the end...
Shift by Jennifer Bradbury (YA) is a new book, published in 2008. Chris and his best friend Win decide to cycle cross-country from West Virginia to Seattle. Only Chris comes home, and Win's overbearing and controlling father suspects that Chris knows more than he's telling. This one was extremely hard to put down, but we're trying to hold our kids to no books at the dinner table (we all get to read at lunch during the summer, but not at dinner), so I had to read it in two big gulps rather than just one.
I'm currently about halfway through Genius Squad, by Catherine Jinks. It's a sequel to Evil Genius, which I didn't like quite as much as I had expected it to do. When it comes to writing brilliant, but not always ethical genius teenager, I think both Eoin Colfer and Anthony Horowitz did it better with Artemis Fowl and Alex Rider.