i had downloaded few games from apple store, i hv found some games will auto closed or hang ...that is happen sometimes only. Is that IOS4 problem or the games still not running stable in IOS4?

Ermm..
i had bought ninja fruit with $0.99 usd .. how i make the payment for it ? as i think be4 , i think the charge / payment will auto charge in my credit card bill but that is not process in my credit card yet... what happens it ? Apple will issue one bill to me regarding the Apps /game purchase?