Jailbreak.me is a one-touch jailbreaking app for certain iOS 4.3.x devices. If you're device is on the list below, you're in luck! If not, not so much and you should follow the redsn0w jailbreak process for 4.3.3 in the next step.
Jailbreak.me 4.3.x approved devices:
Select "File > Devices > Back Up". This helps ensure that any data you have on your device can be later restored.
Tap the "Free" button, then the "Install" button that it turns into.