Indispensable tools. If I did not have these I would be emotionally distressed.
Needles of various sizes and uses.
Mechanical Pencil. (I'm addicted, thanks Dr. B)
Clear 2x18'' ruler in 1/8 increments. If it wouldn't be so crowded I'd almost love a 1/16 one. I feel disloyal saying that though. (Also addicted to these because of Dr. B)
Chalk wheel (the Clover brand one specifically. I have one in white and one in blue.)
Embroidery scissors. I've only had them for about a year but I seriously don't know how I functioned without them. Great for itty bitty thread cutting and maximum close up snipping control.
Sharp sewing scissors. My first pair of sewing scissors were actually my great grandma's (actually, so was my first sewing machine) but they were really old and I think I didn't know enough then to not use them on paper or whatever I needed to cut. They were dull as all blazes. Hellishly so. I got new scissors my sophomore year in college and...it was like the heavens opened up. Angels sang, even.
Rotary cutter. Just don't be tired or absentminded with them, seriously. Fingers can be lost and I really love my crooked skinny fingers and all the things they're capable of. You should love your fingers equally well. Yeah, I just told you your business. Still, appendages are best while still attached to your body -more often than not.
Music. Seriously. The kinds of Cd's that I can listen to completely through from start to finish ranging from chill to headbanging depending on my energy needs. Chill for de-stress, headbanging for getting things done with some oomph. I like oomph.
Even while I was at school and didn't take crafting or artsy stuff with me, I still took everything I listed. With the exception of the rotary cutter, the mat took up too much room and there wasn't a really good reason to have it if I had my sewing scissors.
For some reason I just felt like honoring my tools of the trade. I'd be crazier without them.