As far as a keyboard, no, certainly not for gaming.  I do use a Razer Mamba mouse that can be wired or wireless though - when gaming it will always be wired.

I use wireless everything, because wires suck.

I use a wireless mouse, I would use a wireless keyboard but I stick with my laptop these days.

i need something to fling when i ragequit.

Of course, wireless. It's not 1998. Speaking of which, wireless technology isn't what it was a decade ago and you aren't subject to the same disadvantages that were clearly there back then if you went sans wires.

I use a Wireless mouse, a wired one just feels like i'm being restricted somehow.

I'm all wired. Partly because I'm cheap, and partly because if I had a wireless mouse, I'd be paranoid that I was getting a delay, even though there never is.

Wireless keyboard and wired mouse.  If I do get keyboard lag... I never notice it.  As for my mouse, I just bought one of those Razor mouses because they look cool. =P

I use wireless for both. I prefer the weight that's added with the inclusion of batteries in my mouse.

I have a cheap $20 combo logitech wireless mouse/keyboard setup on the computer i have hooked up to the TV, the mouse can be flakey so i don't usually play twitch games on it.

Wireless mouse, never noticed any lag.

nope

No because I'm sitting right next to my computer tower.  It's useless for me to have a wireless keyboard and mouse.

I prefer to use wireless technology where possible. Wires suck ass, they get in the way and stop me from relaxing on my sofa whilst playing Painkiller on my P.C. 

On my old PC I had a wireless mouse & keyboard. I used them because they came with the PC. There was never any noticeable delay. Now I have a laptop I just use the laptop keyboard & a USB wired mouse.

Pay more and get lag? 
Hell no. 

I use wireless for both.  There aren't any drawbacks, unless you consider burning up four AA batteries a year in your keyboard a drawback.  Any lag you think you're experiencing with modern wireless peripherals is all in your mind.

I only use a wired mouse, I like the reliability of a wired keyboard... Although the wires are a bit bothersome.

I use wired mouse/keyboard because I don't really care for wireless or DPI or mouse weights or any of that nonsence. I've known people to spend loads of money on 'tornament grade' shit and then come in the bottom half on the scoreboard in a game while I was rocking a 7 year old ball mouse and come in the top 3 regulary in a COD2 Rifles match.

My keyboard and mouse are wired.  My tower is right next to me, so the wires reach perfectly with plenty of slack.  Plus its just what im use to when sitting at the computer.  Console gaming on the other hand...

Keyboard and both mice are on the main PC are wireless. We have the computer connected to the TV mostly, and everything works fine up to a range of about 6 feet. For web surfing, TV watching and laid back games, we have a trackball. Otherwise, we have a nice mouse with rechargeable battery thingies.

I use a Logitech G9 wired. No wirelessness here, i just don't see much of a point. Besides for that it seems like a hassle to have to charge the damn thing all the time.

My mouse is wireless.

Mouse is wireless because a wire can easily snag on my crowded student desk. A keyboard is static for me that doesn't need to be wireless.

The delays in wireless mice are not significant enough to make any difference. I still use wired but only because i buy the cheapest mouse/keyboard i can find at walmart once a year.

I preferred wired accessories. I don't like having to deal with regular or rechargeable batteries. 

i use to have a wireless mouse and keyboard. it came with the computer that i bought. the left click broke so i couldn't click, and keyboard just stopped working. i put in new batteries it didn't help so i bought a new keyboard. i'm happy with having a wired keyboard and mouse.

Only a mouse on my Macbook as it is easier - sometimes - to use (especially on RTS games).  Otherwise, a wired keyboard and mouse on my iMac is fine.

Mouse only. I hate hate hate it. Its some MS bluetooth mouse but yet it needs a USB dongle to work so I can't simply use it with my laptop. Also its very heavy due to needing AAs and has lots of tracking and response issues. 

" Pay more and get lag?  Hell no.  "

" I preferred wired accessories. I don't like having to deal with regular or rechargeable batteries.  "

" Mouse only. I hate hate hate it. Its some MS bluetooth mouse but yet it needs a USB dongle to work so I can't simply use it with my laptop. Also its very heavy due to needing AAs and has lots of tracking and response issues.  "

I have been using this Logitech Wireless+Keyboard mouse combo that I bought almost 7 years ago and still have no issues with them. 
Long live Logitech!

I do not. I would like a wireless mouse to use form bed though. In the mean time I have a long USB extension cable as well as software that lets me sue my 360 controller instead. But I mainly just use it for a media controller while in the bathroom.

I'm not running around my house trying to type stuff on my comp so no. besides, having to charge my keyboard is pointless.

" Pay more and get lag?  Hell no.  "

I use a bluetooth mouse with my laptop cause I hate using the touchpad. Also since I'm constantly moving it, it's less annoying than a wired USB mouse.

Wired. I know the delay in wireless is negligiblebut electricity still isnt wireless.
 
EXAMPLE: 
-Playing CoD4 with a college friend a few years ago
-He suddenly stops moving and is looking right at me 
-"Damn, mouse batteries are dead" 
-I wait for him
-Teamkills me in the face
-"OK, got new batteries"
 
Been traumatised by wireless mice ever since.

Ive never been a big fan of wireless m/k ... there are situations where it comes in handy (using your PC on a TV or as a media center in your living room) but my setup always was of the "PC on a desk" type ... so wireless is kinda pointless for me.

I use a wireless mice, because wired is the worst. 

" I use wireless everything, because wires suck. "

Wires rock, batteries suck.

I found a keyboard I liked and didn't care whether it was wired or not.  It was wireless.

I used to use a wireless keyboard and mouse but they run out of batteries or disconnect randomly from their receiver boxes. Now I just use wired stuff for PC.

Wireless all the way. Unless you are some sort of super-pro gamer or something, lag isn't a problem. Also changing batteries isn't really an issue with newer mice and keyboards. My mouse battery lasts well over a year and my keyboard batteries last at least three months. They also keep track of the battery level so I can change them at around 10% to avoid any annoyances of them cutting out.

I use both wired keyboard and mouse. I move my setup very rarely so having wires don't bother me.

I'm already so close to my tower, I don't see the point.