Your chances of having the first one on the block: High, as the new iWow hardware was released just this month. (The iWow 2.0 software shipped in October.)
What you must know: The hardware adapter is not certified for the iPhone, though users report it works when the iPhone is in airplane mode. SRS Labs released a Mac-only iWow 1.0 iTunes plug-in in 2007 for $30, and it quickly gained popularity. The latest iWow plug-in adds the enhanced versions of its capabilities to both Mac and Windows versions of iTunes and to your iPod directly.
What you need: Any iPod for the iWow hardware, and a Mac or PC with iTunes 6 or later for the plug-in software. The adapter costs $100, while the plug-in software costs $80.