The deluge of Mango devices isn't over yet. Hot on the heels of the Lumia 800, the Titan, Radar and the wallet-friendly Focus Flash comes the Samsung Focus S. There's not a whole lot of mystery to Sammy's flagship Windows Phone 7.5 handset. It's not terribly different from many of its cousins packing Microsoft's mobile OS and, other than size, there doesn't seem to be anything separating it from its little brother, the Flash. What, then -- aside from a few Galaxy S design touches -- does Focus S offer your high-end smartphone dollar? And are those differentiators enough to make it the clear choice when shopping for WP7 device -- especially when considering the $150 premium AT&T is asking for, over the surprisingly satisfying Flash. Head on past the break to find out.