I strongly agree with this one : "Clean Room Means No Work"
Because clean room means that we spend more time on cleaning than on working! That is why I never cleaned my room any single time since I moved to Bandung from Solo (almost three years). Look at these pictures of my bedroom :
after opening the door, you will see this...

that is my PC close to my bed... too close.

look at the floor, can you name those things?

See? My productivity increases (I can say almost 200%) because my mind focuses only on my job instead of doing useless things. I believe this condition enables me doing many great things, say : last year Cakrawala project for Imagine Cup 2007 (we won third place and I did all the code by myself). I never stop recommend my friends to do this and most of them said that their productivity has also increases greatly ever since.
How about yours?