I like to watch my regional news on the BBC website, which still uses Realmedia as one of the main options. Since Windows Media doesn't work without crashing on my mac, I use Realmedia.
I don't know of ANY other website that uses Realmedia anymore, i'm surprised it's still being made, do any other websites use it?
TVA still use Realmedia (though I can rarely get the forced plugin to work in my copy of FF these days). I'm also planning something with it for an upcoming feature. Neither really class as a major website though!
It's always quite surprising just how fast the most dominant video format on the net almost completely vanished into obscurity.