This package will allow your 5.0.1 device to reboot without requiring an external tool such as redsn0w.
Corona is the underlying untethered exploit installed by popular jailbreak tools such as redsn0w, absinthe, cinject... if you are using 5.0.1 and you can reboot your device and have it still be jailbroken, you have Corona.
Some of these jailbreak tools do not tell Cydia that Corona is installed, so you might have to manually install it rather than upgrade it to get new versions.
If your device relies on Corona for untethering, which includes any iPad 2 running 5.0.1 or iPhone 4S running 5.0 or 5.0.1, uninstalling this package will unjailbreak your device.
Unfortunately, the original version of Corona had sandbox kernel patches that broke iBooks. As of 1.0-5, Corona uses the working ones from comex.
As of Corona 1.0-6, planetbeing has done a large amount of work to improve errors loading images in iBooks.
Versions 1.0-6 and 1.0-7 did not work on iPhone 4S 5.0, despite the package claiming to install on that setup.
Version 1.0-1 and 1.0-2 were not able to upgrade Corona as installed by redsn0w: this was fixed in 1.0-3.
There was a major bug in version 1.0-1 of this package that caused `launchctl` to malfunction; this is fixed in 1.0-5. :(