Thanks everybody for the great posts on getting that much better with SU.
As Monsterzero has said on another post, "my head is going to explode".
The sheer volume of HELP by the good people in the SU universe is mind boggling.
As a Mac user -- I want to supplement what Cadmastr has said about video viewers and players.
There is freeware available for Macs called TubeTV, http://www.chimoosoft.com/products/tubetv/
In addition to the above I have an excellent DVD player freeware called MPlayer OSX:
http://mplayerosx.sourceforge.net/
I can save the any video from the Internet and then play it in half or full screen on MPlayer.
Danty