The smallest and least expensive speaker in G-Project's lineup, G-Zip Wired Travel Speaker ($20) looks somewhat like a grenade, and certainly caught our attention for that reason when we spotted it at CES. Using a retractable audio cable to connect to your iPod, iPhone, or iPad, the speaker packs a battery that lasts up to eight hours and is charged via the included Micro-USB cable. In addition to the silver version here, a blue version will also…
