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Here's my problem with the accepted solution -- How do you know that these aren't 3-way switches??
"One of them controls the lamp in the attic" -- which says nothing about whether the other two switches also control the lamp in the attic.
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Usually up is on such as decora, or the old switches were marked on and off.
Or take off the panel, and use a current meter to determine the on position, or volt meter or test light.
Turn all 3 switches on.
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Its so simple.. you turn ON ALL switches
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I'd say I'll use logic gates for this one. Not sure if it will be valid, don't care either if it is or not. 
Say we are talking about OR gates, we can have a single switch be turned differently from the other two switches. We will then have 1+0+0=1 or 1+1+0=1. Then the lamp is on.
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Assuming the bulb is incandescent and the switches are 1 -2 - 3
turn on switches 1 and 3 - wait 10 minutes - turn off switch three
go to the attic - if the light is on, switch one activates the lamp
if the light is off, feel the bulb
if it is warm, switch 3 activates the lamp
if it is cold, switch 2 activates the lamp.
SushiSlayer
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I got that in less than a minute a few years back. 
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I haven't looked at the other posts yet, so I'm throwing my solution in before I go reading.
Turn on the first switch.
Wait a while.
Turn off the first switch.
Turn on the second switch.
Go upstairs.
If the light is on, it's the second switch.
If the light off, feel the bulb.
If it's hot, it's the first switch, otherwise it's the third switch.
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I attempted to prove the solution is viable but in the attempt I broke my ankle stumbling over all the junk in the pitch black attic as I tried to get to the light. 
>>> Mental note: Only attempt this during the daytime and only for attics with windows <<<
- Kelly
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"...but you need to come into our office to work."
Huh? 
Something I hear oh so many times on the phone these days.
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I work from home full-time now. My company's HQ is in another state.
I never have worked for a company that wants you in the office, and telecommuting was alright. It was one or the other, for me.
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Maybe they ask you to come to the office once per week (or something like that).
I'd rather be phishing!
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I worked for a company like that once.
What it means is you work in their office. When you think you are on vacation, you get to telecommute instead. When you think you are at home for the night and winding down for the day, it means they will call you at home for the daily emergency (sometimes they forget they already had the emergency and call you 3 or four times during the night).
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You mean at Apple Corp 
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I'm on the Farcebook homepage.
Just one click away from creating an account.
I'm about to give up my beliefs for a bit of social engagement.
So... Should I? 
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NO!!!!!!!!!!
Contrary to popular belief, nobody owes you anything.
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Yup.
Personally I think it's retarded, but only because it's a poor excuse for social interaction and filled with narcissistic people that post crap for attention. That being said, you should give it a whirl so you can see what the fuss is about and decide for yourself. Just don't be one of those peeps that thinks it's more important than real life though.
Jeremy Falcon
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I've been putting this off for years, even when my best friend said I should definitely take FB...
Guess you're right 
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Just do it. The worst thing that could happen is you get addicted to it and become a FB junkie - selling your body and soul to crack whores and pimps on the street for just a little bit more FB time.
See, nothing to worry about.
Jeremy Falcon
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Jeremy Falcon wrote: selling your body and soul to crack whores and pimps on the street
That doesn't sound so bad! At least it's a little social interaction that isn't Facebook
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Sander Rossel wrote: At least it's a little social interaction that isn't Facebook
+5
Jeremy Falcon
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And how is that different from the Lounge?
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Says the man who has chicks as 98% of his friends on FB!
veni bibi saltavi
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So how's the stalking life treating you?
Jeremy Falcon
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No. Get yourself a hobby and join a club. You will get to know lots of people with the big bonus that they have some common interest.
The language is JavaScript. that of Mordor, which I will not utter here
This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
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