Joe...I use either SMPlayer

or The KMPlayer, but there are others which will play .FLV files.

Each plays & pauses with the space bar. SMPlayer uses . (a period) and KMPlayer uses F for frame-by-frame advance.

Now, to do this you must have the FLV file from YOUR cache loaded....you can't do it IN YouTube.

I have mentioned a few times that everyone ought to learn how to find the files in their cache. (I have told my Opera browser exactly where *I* want my cache located.) It starts in "documents & settings...etc.", but I moved it by typing "opera:cache" and locating it and editing the Opera .ini file with a new location.

There are also FLV downloaders, but I haven't used one recently, since I discovered that I already had the files. If you can't figure out your cache, you might want to Google FLV downloaders...there are several.