Talk to iPhone games developers, and the feature they're most excited about in the new iPhone 3.0 software is the ability to do in-game micro-transactions. And while you might wonder if this is just an excuse to get iPhone gamers to dip into their wallets even more often, it's actually a hugely positive thing for several reasons. Downloadable content, virtual items, subscription billing and fast-track social advancement are some of them, so Pocket Gamer looks into a bit more depth about what you can expect on the micro-payments side once iPhone 3.0 debuts