Apple released a 4th update to it’s iPhone SDK.
Some of the changes are:
-The Simulator now supports OPENGL ES, nice for all 3d rendering (games and such)
-New firmware version 5A258f (no news of new features yet)
-Code signing enforced. All developed apps require to be signed to be able to run on the iPhone.

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The code signing seems to be a problem for the developing community who doesn’t have a iPhone developer subscription. If a developer doesn’t has a valid certificate, the apps won’t run on the iPhone, but they will run in the simulator. (more work for the iPhone dev community i guess)