What is the number one jailbreak tweak you can't live without?
If I were to be completely honest, it would be NCSettings. I absolutely hate it when my phone catches a crappy Wi-Fi network and I have to go into settings to turn it off.
I use that daily. Not to mention that I use the flashlight ability on a regular basis because I'm a clutz and hit everything when it's dark in my apartment.
Let the games begin!