This is something really Epic. The company fighting against Jailbreak now copies the work of Jailbreak Devs and port it into the iOS 5. Even recently Apple hired a Jailbreak Dev Called Peter Hajas to work with them on to improve the Notification System in iOS 5. Apple was so impressed with this work that they hired him.
Below is a video of all the Features iOS 5 is offering.
After you have seen the video now you will be amazed to see the features which Apple has copied of Cydia Tweaks. A user on youtube under the video Comments posted the Tweaks with its name and time, Hope this helps.
The Tweaks and their names are given by MrJailbreak1
0:56 = MobileNotifier + LockInfo + Android status bar
2:25? = qTweeter
2:45 = Instapaper (App Store)
3:17 = SlideAway(+Music & other apps)
3:20 = CameraButtons/SnapTap (+Headphone buttons)
3:36 = Rich Text For Mail
4:39 = PingChat! (App Store)
5:02 = Wi-Fi Sync