[videoblogging] how to play .flv on my computer

[B Yen]

dumb question:

I've got a Mac running OSX, how do I play some Youtube .flv's I  
downloaded?

Everytime I double-click on them, it trys to run Flash (which I don't  
have the license for).  Surely there must be a nice 3rd party player  
out there.