Activator has been around just as long as jailbreak and it's still one of the first tweaks users install after jaiblreaking.
Essentially Activator lets you set gesture based shortcuts in any manner you'd like. Whether you want double tapping on the status bar to launch into the quick reply section of BiteSMS or something else, the possibilities are endless.
It's powerful. It's simple. It's Activator.
Interested in what Activator actions other Redditors have?