Now, to start of off with our first discussion, a matter which is the subject of much controversy in the world of contemporary composition: the use of Computers vs Manuscript paper.
Personally, I find computer programs like Finale and Sibelius to be fantastic for editing, organizing, and printing the final scores, but I can't write freely unless I'm sat down at a piano with a pad of manuscript paper and a pencil. Something about writing the score from scratch using a computer seems restrictive to me. Those programs seem to lend themselves to very vertical and machine-like music. As beautiful as organization can be, a great deal of classical music derives its beauty from chaos. It seems hard to believe that a piece as entropy-filled as Stravinsky's Rite of Spring could have been written on a computer program. Even at the other end of the classical spectrum, the third movement of Beethoven's Symphony No. 3 (which sounds like the score from a cowboy film) could not possibly have been composed solely on a computer program, regardless of the extraordinary playback which the programs provide. I say manuscript paper wins over computer programs and will always be the easiest and most organic medium for composition.