In case anybody is wondering, works great for the first gen iPhone, I've had no problem using my iPhone with my iGroove HG. Sounds great, though it does give static and background interference when a call goes through or if receiving a text. I'm not able to use it while listening to a radiostation, such as Pandora Radio for the same reason. Otherwise, sounds great and charges my iphone at the same time. It'll ask you when you first plug in, whether or not you would like to place in Airplane mode, which of course will disable any phonecalls or messages, but it'll stop the static/interference. I use mine at bedside and it makes a really nice, loud alarm clock. Add one of those programs like iSleep and you've got yourself some great sounds to fall asleep too. I love my iGroove! James is right though, doesn't charge the iPhone 3g, though you can still play music through it.
Ed