iPhone 3G/3GS owners, meet the GO-DAP      A while back I stumbled across an introductory post in the Sponsor Announcements and Deals Forum on head-fi.org for the new GO-DAP portable headphone amplifier for the Apple iPhone 3G/3GS from VentureCraft. As an owner of an Apple iPhone 3G, I was intrigued by what I read. The GO-DAP was designed as an all in one solution for the active audiophile iPhone 3G/3GS owner. It's a portable amplifier first and foremost, but it also offers the convenience of a built in Line Out Dock and offers a...