My Tools:
A 0.5mm mechanical pencil, a big eraser, some good quality music paper stock, and a tuning fork (A440). A little old school, but true to the art.
My "Studio":
A PC on a crowded desk, an Alesis Fusion 8HD keyboard, a Roland Juno-106 hybrid synth, and a variety of rackmounted processors and modules.
My Software:
Sibelius 3. I have nothing against Finale, just wanted to try something different. Very pleased with the end product, and I think you will be to.
My Assistant:
Our cat, Diego, who firmly believes that no music shall be created unless he is firmly planted in my lap. I'll be happy to send a picture upon request!