I like a lot of the ones that have been mentioned: Harry Potter, Narnia, Alias, The Princess Diaries. And I read Sweet Valley Twins and Babysitters Club when I was younger. I absoultely loved the Thoroughbred series, until Joanna Cambell stopped writing them. I also loved Noel Streatfield's "Shoe" books and the Trixie Belden series, both of which are being reissued.
And the Betsy-Tacy books, Laura Ingalls Wilder, Anne of Green Gables, The Dark Is Rising...
"Older" series I enjoy are the Pern series and the various David Eddings series, the Star Trek: New Frontier books, the Benni Harper series....
Let's leave it at that, though I'm sure I'm forgetting some...
Can you tell that I was a complete bookworm as a child?
(Still am, as a matter of fact.)