WINNT\Temp

It really depends on how much you install new programs etc onto the system. I would clean it out approx. once a month. You can use disk cleanup in system tools if you are running w2k or you could manually go in and delete its contents.

Hope this helps

There's no reason to keep 1.6 GB of info there. I clear it out (along with *.tmp, ~*.* and Temporary Internet Files) everytime I notice any kind of slowdown or weekly (whichever comes first).

There is no official answer. It's like putting ketchup on steak; it is a matter of personal preference!
I check my Temp folder probably every couple of weeks, because I don't like it to build up. But normal users don't know there IS a temp folder. When I go and fix user workstations, I usually clean out Temp just as a courtesy gesture.
It doesn't really need to be cleaned out unless you notice a problem on the system.
If you start to get errors on low drive space, cleaing out the Temp folders is the first thing to do to get some fast drive space.

hope this helps