If there was ever a product that made me think "now why didn’t I think of that?" it has to be the rechargeable AA batteries that use a USB port to charge. This is really cool. Now if I could only get my digital camera maker to use non-proprietary batteries I would be all set. Currently my electric razor and in-flight headphones use AAA batteries but for many of you this is exactly what the doctor — gadget doctor anyway — ordered.