I am moderately tall, not very dark, but definitely handsome.

I have the traits of both a kid and a cranky old man. Take that for what you will.
I am slender but relatively fit.
I catch mistakes for a living.
I appreciate proper grammar.
I am introverted in groups, but extroverted one-on-one.
I am on time or early most of the time.
I am a Cubs fan but I try to remain emotionally detached (we've had our issues).
I am a cat guy.

My profession is to help coders improve their code by finding bugs. A glorified exterminator, except I just find them and let other people kill (fix) them.

I have a cat.
I read on the bus.
I watch eclectic video podcasts.
I attempt ambitious exercise programs.

Seeing things most people don't see (keen powers of observation).
Fixing your computer.
Words with Friends
Scramble with Friends
Consuming Cadbury mini-eggs.

I'm generally quiet, yet quite friendly to people I've just met.
I also tend to be very subtle in my sarcasm.
You will enjoy this once you are attuned to it.

This used to be very detailed, but it just seemed like a laundry list of stuff that really didn't say much about myself.

I watch a few shows, read quite a bit, and don't care for onions and mushrooms.

Most recently I read the Ring series by Koji Suzuki, and am working my way through the Parker crime/mob novels.

wit and verbal creativity
other people's smarts
reading material
quiet
online access (first world problem, obviously)
lists of six items where the final item is self-referential

If my brain was removed from my body yet was provided with all of the sensory inputs it expected, would I notice?

Reading, relaxing, recharging.

I bite my nails.

You have a quick wit and/or are very observant.
You are a fount of knowledge and like to share it and add to it.
You would enjoy receiving a thoughtful trinket over flowers any day.
You don't dislike cats.
You vote.
You are not too religious.
You do not smoke.

You know it is the company you keep rather than the activities you do that makes most things interesting.