...I vote for Sergey Lukyanenko's "Night Watch" cycle (Night, Day, Twilight and Last Watch). I'll also mumble the word "bookchan" if need be.

And for the more visually oriented, I definitely recommend the "Night Watch" and "Day Watch" movies - but enjoy them in the original Russian with subs, the American/"International" cuts of both films are crap.

Even more interesting: I found the movies no letdown when compared to the books.