Found this: http://www.ebay.com/itm/DC-DC-Converter ... 0953393429
Though from china, seems like it would be a great way to power the raspi off a 1000-1500ma lipo battery, making it easily portable.

I've recently recieved my Raspberry Pi, and while it has an alright CPU, it has an amazing GPU. Will there be any APIs similar to OpenCL or CUDA, and if not, how can we use the GPU to our advantage in userspace applications.