In what looks to be a USB flash drive is the world's smallest 3G and Wi-Fi portable hotspot, the Option XYFI. The XYFI is USB powered and can support up to eight devices at the same time. Currently the XYFI only supports 3G (hopefully 4G will be an option in the future) but will be perfect for traveling and avoiding hotels which charge for Wi-Fi.
The XYFI will have an AC adapter, car charger, and an extended battery pack. Look for pricing and availability shortly.