Intel Mac :: How To Delete Internet Streaming Files That Are Causing Hard Drive To Be Full

Here is the back ground information of this situation.  I have a IMAC 21 inch 500GB Hard drive 4 GB RAM, which is up to date with OS X Ver 10.7.3.  So my wife loves to stream her favorite USA TV shows via the Internet, considering we are stationed overseas.  She pulled me away from the NBA playoffs because she kept getting this error of start up disk full delete files (or something to that effect.)  So last week, I deleted about 40GB of old shows that we downloaded and various other files and pictures.  Not even four days later the Hard drive is full again, and I think it is from my wife's streaming habit.  I went to "About This IMAC", to find out where the memory was being used from and its 377 GB used in a "OTHER", and the rest being utilized from APPS, MUSIC, PICTURES, etc.  So next I cleared the history and deleted the cache files and reset safari on both our log in profiles, then logged out and restarted the computer, which did not minimize the Hard drive memory being occupied. Where are those streaming files getting saved specifically, for maybe a manual delete? 

Info:
iMac, Mac OS X (10.7.3)