Remember the PDF exploit from a while back and how Apple released a fix for it, stopping jailbreaks in the process? Well, Saurik, one of the geniuses behind Cydia, has released a patch for the exploit! What does this mean for users? There is no reason to update to 4.0.2/3.2.2. You can keep your jailbreak while staying secure. The PDF Patch is available through Cydia. Also, upon install, it will remove the PDF Loading Warner.
Now that you can have the best of both worlds, will you be staying with your jailbreak?
Note: If you already upgraded, you can follow my guide here on how to downgrade. Although the guide is for 4.0 to 3.1.3, the same method applies for 4.0.2 to 4.0.1.