The problem with Ikaruga's internet rating system was you had to be godly to get on the list-- it was only the top 500 I think. Doesn't sound hard, but damn it is, especially when one player can play again and again and get high scores.
I'd like there to be a way were it's limeted to one player for one score on the list, and also keep track of the top 10,000 or so. It couldn't be too hard. I'd love to know if I'm the 7,398 greatest player in the US. Also having it upload autmatically on your system would rock, because after you win it could tell you you're "world ranking." That'd be cool.