Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/3.1.1 Mobile/7A300g Safari/525.20)
You can check if the battery is charging or discharging, which is essentially the same thing. MemoryInfo does this. So it's not a 3.0 thing.