I'm pretty sure that emTube will receive a cease-and-desist letter from YouTube soon. That's because emTube lets S60 users, browse through, watch, and even download YouTube videos. A great side effect of the last ability is that if the said user has some Flash video files (.FLV) stored on his smartphone, he'll be able to play them too.

Another great feature of emTube is that it can play videos in landscape mode, allowing the user to maximize the screen size of their S60 mobiles. For now, I'm enjoying the site (and it's recently released newest version), as well as taking bets for how long before YouTube will seek to shut the service down.