According to 9to5Mac, a Russian hacker has published a relatively simple method that allows users to obtain in-app purchases from many iOS apps for free.
The method, which doesn’t require a jailbreak, involves installation of two certificates on the user’s iOS device and changing DNS entry in wi-fi settings. Then users can perform purchases of in-app content as usual.
The iPhone Dev-Team released RedSn0w 0.9.14b2 with improved algorithm for baseband downgrade from the iPad’s 06.15 baseband to 05.13 on the iPhone 3GS and iPhone 3G. The 06.15 baseband was used by many users to unlock their device. Now it is possible to to get back true GPS and an ultrasn0w unlock.
You can download RedSn0w 0.9.14b2 .
Here is additional info from DevTeam: