Apple has been very vague as to what is included in the iPhone updates, in particular with regards to the 1.1.2 update: "...new features and bug fixes..." leaving many users -primarily jailbroken/unlocked iphone users- wondering if it is worth updating just for the sake of updating. Although it is not officially stated, apparently the iPhone CPU clock speed was boosted with this update. As soon as I installed the update, I noticed that applications loaded faster and in particular web pages loaded much faster in Safari. Using sysinfo several users have been able to confirm this. The CPU frequency was 400 MHz while the bus frequency was 100 MHz in the iPhone 1.1.1 firmware. The iPhone 1.1.2 now shows a CPU frequency of 412 MHz and a bus frequency of 103 MHz. If that is not enough to convince you to upgrade I also noticed that this update makes the iPhone, in particular Safari more stable. Safari would crash for me about once a day in the earlier version, it hasn't crashed so far for me.