Will the iPhone case work with the iPhone 3GS?

While not officially supported, based on consumer feedback and independent testing, the Receiver Hard Case for iPhone 3G also charges iPhone 3GS.

Can I charge my MacBook with Powermat?

Currently Powermat is intended for low-voltage devices like cell phones and other handheld devices. We demo-ed a high-voltage Powermat at CES 2009 and expect to bring one to market in the near future.