I enjoy these living composers of concert music in the classical tradition

John Adams, Philip Glass, Nico Muhly, Krzysztof Penderecki, John Corigliano, Chen Yi, Joseph Schwantner, Eric Whitacre, Dana Wilson, Steve Reich, Arvo Pärt, Melinda Wagner, John Mackey, David Lang, David Rakowski


I enjoy these living composers of primarily film music

Alexandre Desplat, Danny Elfman, Hans Zimmer, James Horner, John Williams


Awesome music notation stuff

LilyPond - an open-source music engraving program, part of the GNU project.
Frescobaldi - excellent text editor for LilyPond, also open-source.