Despite the lack of (as yet), an untethered jailbreak, the Sn0wbreeze and Redsn0w tethered utilities - along with the SemiTether patch - have seen the Cydia community continue to thrive through to iOS 5.
Before the belated introduction of Siri, Notification Center was the main talking point of Apple's much improved operating system for mobile devices - iOS 5. Although the voice-recognition software is marvelous and all, the improved notification infrastructure has to go down as the prized feature of what is (besides the battery issues) a very well put together update.
