Boys especially like…

Some series that appeal to boys:

Time Warp Trio – Jon Scieszka
Diary of a Wimpy Kid – Jeff Kinney
Captain Underpants – Dav Pilkey
Ricky Ricotta – Dav Pilkey
Pokemon – various authors
Star Wars – various authors
Percy Jackson and the Olympians – Rick Riordan
Flat Stanley – Jeff Brown
Stink – Megan McDonald
Martin Bridge – Jessica Scott Kerrin
Henry Huggins – Beverly Cleary
Bunnicula – James Howe
Hank Zipzer – Henry Winkler
Geronimo Stilton – Geronimo Stilton
Secrets of Droon – Tony Abbott
Underland Chronicles – Suzanne Collins
Pendragon – D.J. MacHale
Joey Pigza – Jack Gantos
Shredderman – Wendelin Van Draanen
Melvin Beederman, Superhero – Greg Trine
Magic Treehouse – Mary Pope Osborne

Some authors who appeal to boys:

Dan Gutman
Gary Paulsen
Matt Christopher
Mike Lupica
Gordon Korman
Margaret Peterson Haddix
Andrew Clements
Jerry Spinelli
John Bellairs
Eoin Colfer

More recommendations:

Jon Scieszka’s Guys Read website
Michael Sullivan’s Books for Boys website
For graphic novels and comics, try the Sidekicks website
Great Books for Boys: more than 600 books for boys 2 to 14 by Kathleen Odean