How can I play .ogg files?

[Steven M. Sawczyn]

Now that I'm finally getting used to iTunes, I find that it can't  
play .ogg files.  Unfortunately for me, much of my music library was  
encoded in .ogg.  Is there a way to play ogg files in iTunes?  It  
doesn't look like iTunes supports plugins, or anything of that  
nature.  Assuming it's not possible, is there a way to easily convert  
the ogg files to something iTunes will accept?  Worst case, is there  
another player I can use -- I'd prefer to use one player, but if  
that's not doable, I'll do whatever's best.

Thanks,
Steve