A funny thing about the books my kids picked is that all of them were Usborne/Kane Miller books. Yes, I am an Usborne Books consultant and we have a lot of these books but we also have lots and lots and lots of other books (just ask my husband) and books from libraries. Here are some of the books they read:
Knights Handbook, Conspiracy 365-January
Cleopatra, Hansel and Gretel, Florence Nightingale, Heidi
My daughter loves the Usborne Famous Lives series, actually my son loves this series also. The Famous Lives series has greatly impressed me as well. The books present famous people in a very interesting way, with lots of detail and the kids remember almost everything in the book and can repeat it to you. My kids also talk about these books to many people without being asked to, even long after they have read the books. The "Young Reading" series is also a big favorite of my daughter's.
My daughter is now asking for an "All Writing Day", she enjoys writing but my son does not like to write. Since my daughter knows her brother doesn't like to write, she came up with a possible solution, she said we'll take turns making up parts of stories and she'll write them all down. We'll see what the future brings.
(These books can be found at: http://www.usbornebookstore.com/)