Whoever thought that Harry Potter is "top 100 books" is touched in the head. The series is a fun read, but there are a *ton* of other, better children's fantasy out there... maybe not quite as popular, but better.
Why do they have the Chronicles of Narnia and Lion, Witch and Wardrobe listed separately? Last I checked, LWW was the 1st or 3rd (iirc) book of the series (depending on which way you're counting it)
They have Hamlet listed separately from the Complete Works of Shakespeare...
Da Vinci Code was a good read, but I think it made it on because of popularity...
At least Winnie The Pooh made it

(one of my favorite books of all time ;P)
There's several I started, but couldn't keep going; there's a few I couldn't recall if I've read...
2 The Lord of the Rings JRR Tolkien
4 Harry Potter series JK Rowling
5 To Kill a Mockingbird Harper Lee
8 Nineteen Eighty-Four George Orwell
9 His Dark Materials Philip Pullman
11 Little Women Louisa M Alcott
13 Catch-22 Joseph Heller
(some of) 14 Complete Works of Shakespeare William Shakespeare
16 The Hobbit JRR Tolkien
18 Catcher in the Rye JD Salinger
21 Gone With The Wind Margaret Mitchell
25 The Hitch Hiker's Guide to the Galaxy Douglas Adams
27 Crime and Punishment Fyodor Dostoyevsky
28 Grapes of Wrath John Steinbeck
29 Alice in Wonderland Lewis Carroll
33 Chronicles of Narnia CS Lewis
36 The Lion, The Witch and The Wardrobe CS Lewis
40 Winnie the Pooh AA Milne
41 Animal Farm George Orwell
42 The Da Vinci Code Dan Brown
46 Anne of Green Gables LM Montgomery
48 The Handmaid's Tale Margaret Atwood
49 Lord of the Flies William Golding
52 Dune Frank Herbert
57 A Tale Of Two Cities Charles Dickens
58 Brave New World Aldous Huxley
61 Of Mice and Men John Steinbeck
72 Dracula Bram Stoker
73 The Secret Garden Frances Hodgson Burnett
81 A Christmas Carol Charles Dickens
87 Charlotte's Web EB White
(much of) 89 Adventures of Sherlock Holmes Sir Arthur Conan Doyle
91 Heart of Darkness Joseph Conrad
92 The Little Prince Antoine de Saint-Exupery
94 Watership Down Richard Adams
98 Hamlet William Shakespeare
99 Charlie and the Chocolate Factory Roald Dahl