Aero is a replacement for the default iOS app switcher or multitasking bar. It doesn’t offer additional functionality like Imperium, but it looks quite cool.
It comes with various animation styles such as: Linear, CoverFlow, Rotary, Wheel, Cylinder, Time Machine etc. You can use Activator to configure Aero to be your default app switcher or assign some other Activator control to access it.
You can also tap and hold on the app icon to close the app (which kills the background process). It’s difficult to describe it, so check out the demo video to get an idea:
Aero is available on Cydia for $1.99. Let us know what you think of the jailbreak tweak in the comments.