James Patterson's 'Maximum Ride' series (you can find a list of them here ~ 4th block down) started off really well, but I haven't read the later ones. He does pretty good action thrillers, so they might be worth a look.
Phillip Pulman's 'His Dark Materials Trilogy' (3rd block down) I can always recommend, a brilliant trio of books with more action adventure than you could shake a stick at.
Terry Pratchett's Tiffany Aching series, 'The Wee Free Men', 'A Hat Full Of Sky' and 'Wintersmith', are just wonderful and well worth a read. He has a 4th in the series coming out this year, 'I Shall Wear Midnight'.
I hope you find a good read for yourself soon, and you must come and tell us what you have been reading!