Service got the final shut down last Friday. Didn't see anyone opening a thread about the closure (though people commented quite a lot about it over the past few months), so decided to open this, to share respects to it.
Personally, I've had some pretty good times with it, especially in the first days of having my first, original iPhone. Times of magic, times of competitiveness, times of repeating a task because my achievement didn't get registered the first time, times of sadness too.
Just like many other cool services, that have gone away, I think this one will forever remain in the hearts of iOS gamers.