Is it necessary to shut down computer every night or ever?

Certain members of our family shut the computer down when they are done using it. I have heard this is not necessary to do; daily or ever?
iMac Intel Core Duo   Mac OS X (10.4.6)  

I've used Macs since they came out, and had one at home soon after (a Mac 512K enhanced). I've never shut down my Mac at night. I've never had any problems where I had to take the Mac in for repairs. Even now, I leave my Mac in the office in sleep mode, and anything I bring home in sleep mode. That's it. Over the years people have sought to scare me one way or another by telling me that the insides of my Macs were going to melt, that the heat would kill the drive, etc. Well, none of that ever happened. Sure, there were times when I shut my Mac down -- when I traveled for some extended period, when I was taking it somewhere else, and so forth, but certainly not everyday and not for long periods of time. Leaving it on is fine.
Now, software... a whole other matter.
Good luck.
--Waiting for a 24" iMac 2.16GHz, w/2GB, 500GB, and the 7600 GT w/256MB, to be delivered this week. When I get it I will post a review. In the meantime I've posted on my blog about it and the other things I plan to add to the set-up:
http://www.woodmoorvillage.org

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