My favorite pen of all time is a blue bic. Love them.
Rollerball in blue, red, purple, and black. I sometimes need to track 4 different types of corrections to page proof.
Black Sharpie for addressing envelopes and touching up black shoes. I’ve also tried to use one to hide the gray in my mustache. 
Silver Sharpie just because.
Purple ballpoint for personal use.
I just bought a Pilot Dr. Grip 0.5 mechanical pencil and have been enjoying it. Very comfortable for the many notes I must make at work. It stays in my desk; in my purse I carry a Tul medium with blue ink (they were out of fine, which I prefer) and a Sharpie Micro, so often handy.
I like gel pens.
Standard No. 2 pencil, but I almost never use a pencil.
Rollerball, fine or extra fine, blue (well, purple, actually, but **Absolute **said I couldn’t say that!). I use blue because it’s easier to tell if I’ve got to the original or a photocopy and for someone to read corrections I’ve made to a draft document.
I’m left-handed, so I have come to despise ballpoint pens, because my hand position is such that I drag my hand over what I’ve just written and therefore get ink all over my hand.
Pen: Black Pilot G-2 07 about 15 bucks a dozen
Pencil: any basic #2 I don’t need one often
Flair, by PaperMate. Doesn’t bleed thru the paper like Sharpies
I like a good writing instrument.
Since I’m left handed I’m limited on roller ball pens. Most will die within a day because left handed writing pushes the ball in versus dragging acrossed a surface. My preference is a black Pilot Precise V5 or V7 (.05mm or .07mm). Ironically they make a red one that is not as good as an alternate design by the same company (don’t know the name of it).
For mechanical pencils I prefer a .05mm Papermate Titanium which has 3 features I look for: large extendable eraser, retractable tip, and a spring loaded mechanism that obsorbs excess pressure. The last feature is nice. If too much pressure is applied the spring absorbs it versus the lead and reduces the number of times the lead breaks.
I have Pentel .3 .5 .7 and .9. I think I prefer the .7
Pencil black Warrior nice soft lead.
Pens I prefer gel then roller ball. Black and thick
I’m also left handed, and I’ve long given up on cheapo pens. Usually I look and fiddle around with pens at a store when I’m looking for some more to find what seems right. But I never realized the impact of left handedness on pen design. I guess I’ve assumed I’d always be a bit awkard with pens. Where can you get leftie pens at?
I haven’t used pencils since college math classes, and I went through plenty, but for them, I invested in a good sharpener, and bought cheapos. I much prefer sharp pencils for math, and pens for anything else, but at the end of a long test I was always stuck with a nub of a pencil.
As for pen color, I prefer black, but blue works fine as well. I’ve used purple and other weird colors in the past, but only rarely. I haven’t gone into the truly expensive range.
I can’t remember the last time I used a ballpoint pen. I don’t normally write things down on paper anyway, I’m more of a “make a note on my computer” or “scribble it down on my notepad/day-calendar with whatever I can find” kind of guy. And “whatever I can find” includes a pencil, a fibre-tip drawing pen, or a fat marker pen.
I deliberately posted this for the benefit of left-handers. I spent years looking for good rolling ball pen. Even an expensive ball point can be cantankerous for lefties. The Pilot Precise V5 and V7 are one of the most popular pens on the market and can be purchased anywhere in small quantities or by the box. You can get them in black, blue, green and red. The ink dries very fast which is another requirement for left handed writers (no smearing) and unless the pen is defective it will never skip (don’t write over white-out or it will degrade the pen). If you like a lot of ink then a V7 is something akin to a fountain pen without the mess.
Pilot makes fancier versions of the same pen (which look nicer and cost more) but they are the same pen. On a side note, I’ve washed 5 of these pens by accident and none of them leaked in the washer. 1 of them made it to the dryer and that got ugly and expensive.
Pencil: .9 mm mechanical twist-out, taken from my grandfather, marked “US Government”
Pen: blue “Dr. Grip” filled with .7 mm G2 refills, black
For pens: Uniball Signo gel grip .7 mm, Pentel EnerGel .5 mm, or a Zebra Zeb-Roller 2000 .7 mm, all in black. The Pentel is my favorite, and has a needle tip. The others have roller balls. They’re all around $5 for a package of two or three.
When copy-editing, I go with a needle-point red gel pen or a super-fine point Sharpie in purple. Yes, purple.
Who the hell thinks of pen names, anyway? They sound like they should be parts of colonies on Mars, not something you write with. EnerGel, for when the poisonous gases won’t let you get to your Martian bog berries . . .
For pencils, I like a mechanical pencil with a .7 or .5 mm lead.
Pencil Number 2 pencil from the coffee cup on my desk. Each inscribed “A gift from Paul in Saudi.”
(People take them anyway. I find them all over the base.)
Pen Black uniball 0.7mm (that is to say thick and heavy) I buy them by the box.
Pencil: #2 pencil with round sides instead of hexagonal.
Pen: Blue Pilot fountain pen (I have a purple one too :D). The ink flow is a bit more than I would like, I prefer a finer line and less need for blotting.
The pencils came in a 12 pack for 2 dollars or something (oh, and I have a free one I got from the sexual health group on campus on Valentine’s Day), the fountain pens were around 4 dollars each.
I love to write, but it really bothers me if my writing instrument isn’t shaped right because that makes my handwriting messy. I’m constantly rotating my pencil so I can write with the proper edge, and I’m still searching for the perfect pen. I think a calligraphy pen might solve my problems, it has that nice angled edge.
Fine blue or black rollerball. Occasionally, .5mm mechanical pencil. Ballpoint pen in times of desperation only. When in a geeky mood, copperplate dip pen. 
Amateur.
Use a pen.
Blue Uniball Signo here, too. I write a lot for work and have really come to enjoy this pen in particular.
Completely unhelpful answer, sorry: I don’t really use pencils anymore, and pick up whatever pen is handy at the time.
I do tend to pick up blue Bic ballpoint pens, though.
Rollerball, extra fine, black, between $5.00 and $10.00