Square, the pay-by-smartphone credit card swiper, just announced Works With Square, a program encouraging partners to build accessories to go with the payment ecosystem. First to launch is Griffin's Merchant Case + Square Reader, an iPhone case that incorporates the Square reader in both swiping and storage positions.
The Griffin case is pretty ingenious, stabilizing the Square reader when it's plugged into the iPhone's headphone jack, and stowing it in a recessed slot on the phone's back when not in use. Square hopes that Works With Square will bring lots more officially-sanctioned Square accessories to market, sort of like a business-oriented version of Apple's Made for iPhone accessory partnerships. [Griffin Technology, Square via The Verge]