If you want to encourage reading among your young adult students, you might consider sending them to view publishers sites. Many of them are offering a "browse before you buy" feature, allowing interested students the opportunity to read the first chapter of two of a new or upcoming novel,
Harper Teen lets you do just that! Current offerings are mostly of the "vampire" genre, thanks to Twilight, but there are many others if you dig a little. Enjoy!
Also: check out their podcast. (Interviews with authors, reviews etc.)