Jacob loves (and has done for a couple of years, so since he was 8) Artemis Foul books by Eoin Colfer, Septimus Heap books by Angie Sage, and has loved all of David Walliams' books. He has read the Hobbit at least 3 times in the last 3 or 4 years, and has recently started getting into Terry Pratchett's bookers for YA (Truckers, Amazing Maurice, Hat full of sky etc).
Half the time he reads non-fiction, devouring various science, nature and dinosaur/evolution books. We thoroughly recommend NG for kids magazine.
He would also be gutted if there were no Beano Annual in the house come Christmas; we found this one out when DSD moved out, and took her copy with her after Crimbo before he had read it
Non-PC I know, but he much prefers the older (I prefer classic!?) ones, rescued from my attic where the demon whacker etc still make an appearance
A couple of years ago, he like good old Just William, and flitted briefly through Roald Dahl, but is not much of a fan (neither was I, maybe I read it with 'less good voices' when he was younger...)
Books on his shelf that seem to sit there are Horrid Henry, Flat Henry and Harry Potter but he doesn't read them, although presumably they are popular with other boys his age...
For Crimbo he has asked for Skullduggery Pleasant and Percy Jackson books, following library borrows which he enjoyed.
Hope all this helps, Good luck xx