Better not load any PDFs on your iPhone for a while, not unless you want to risk handing over total control of your device to hackers. The exploit affects all iOS 4 iOS 3.1.2 and higher devices, including the iPod touch and the iPad. [More]
ios 4
Loading A PDF Could Give Hackers Total Control Over Your iPhone
How To Opt Out Of Apple's iAds Service, Eventually
If you don’t want Apple collecting data on you and using it to target you with ads starting July 1st, you can opt out from “any device running iOS 4,” says AppleInsider. The opt-out is automatic when you hit up http://oo.apple.com from an iOS 4 device, and as far as I can tell you can’t undo it, so don’t click the link unless you really want to opt out. Also, it’s not working at the moment. [More]