Do you ever turn off your pc/laptop and...

Mine is on 24/7, mostly because of torrents. Never had any problems, just make sure you have good cooling and you clean PC regularly.

i used to shut it down over night but that was looong time ago, now its on forever just because of the bittorent life i lead :D
but my pc is quite and i have no trouble sleeping at night..

I leave mine on never had any problems. If for some reason im not seeding or downloading then it goes off though.

i leave it on 24/7 and 90% of the year

mine working nearly 24/7

but just have to give him a rest every while...

nah, u have no idea how much your electricity bill goes up

I always leave my PC on for ages and I'm pretty sure it damages my PC.
HDDs and Graphic Cards seem to not like it... But they don't have a choice!
Now who's the daddy?!?! :D

I use mine in the day and late into the night but I always turn if off when i'm not using it. My elec bills are high enough without having a pc on all year round.

24/7 unless I have to restart after installing a program or updating something

For me I pretty much leave my PC on all the time, I do switch It off from time to time.
just to let thing rest for a while tho.