The RedSn0w jailbreak had just been released for the iOS 5.0.1. But, unluckily its not available for the iPhone 4S or the iPad 2. You could jailbreak your iOS on iClerified (choose your device..choose your iOS version..choose your computer OS..get the jailbreak wizard..learn the instructions..and you got it from there).
BBM (Blackberry Messanger), will be available on iPhone and all Android devices. RIM annouced that they want to expand the BBM on varouis platforms. At first, RIM thought it was a risky move to expand, but, the applictation became immensely popular. Cant wait for the app to actually be released, well to be honest im an Android fan :p