The chat is going faster than players can read, maybe allow use to filter certain messages? I could care less about the amount of damage I'm dealing; i can just do the math instead of seeing three messages pop up every second.
This could really be a great, and by great I mean a CAPITAL GREAT great, ipod game. Seriously, think about it. Just do the "pay to get rid of advertisements" thing or offer hints for ten seconds of advertising and you'll hit the $500 fee in no time. (to keep your app in the store you need 500 bucks every year I think