Not All iPhones Will Get iPhone OS 4.0 Features

If your phone is jailbroken, just get "Kirikae" from Cydia. It's multi tasking that works fine on a 3G. Apple just says it's not compatible with older models so people will go buy new ones. Just like the 2G "can't send or receive MMS". Any jailbroken 2G is cabable of receiving MMS just like a 3G or 3GS can. Apple, like any other company, is just interested in selling more devices, so they're not wanting to release these features for older phones, hoping that people will upgrade their 2G or 3G to at the very least a 3GS.