WWDC 2009: iPhone micro-transactions will feature same profit share as App Store
30/70 cut for all in-game purchases

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At this years WWDC, Jon has been liveblogging the event, and picked up on an interesting titbit regarding the 3.0 software update for the iPhone.
In-game micro-transactions have already been announced, but the profit system was a matter of brief discussion for the developers in the audience.
Apparently 3.0 microtransactions will operate on the same share as all iPhone applications, with Apple taking a 30 per cent cut and passing the remaining 70 per cent back to the developer.
Free applications wont be able to use the micro-transaction system, however, so a little extra planning will be required for any developers looking to launch a free-to-play game, such as Runescape.