Wireless charging for phones and tablets is one of those great ideas that never really took off. Because plugging your device into the wall isn't a particularly onerous task, wireless charging is sort of a solution in search of a problem. But, if one has multiple devices - or perhaps users want a easier way to charge devices while in coffee shops - then wireless charging is a bit of a life-saver. The biggest problem is that the charging system is not at all standardized. There are a few variants, with Qi charging probably being the most common. Wireless is also inefficient compared to a standard wall plug, and much of the energy is converted into heat, similar to a traditional lightbulb. But, these problems might soon be resolved.
Two major associations have agreed to work towards standardizing wireless charging: the Alliance for Wireless Power and the Power Matters Alliance. Unfortunately group behind Qi charging, the Wireless Power Consortium, has not joined. This is a bit disappointing because Verizon, Motorola, Nokia, Energizer, Belkin, Samsung, and HTC all stand behind Qi in one way or another. Oddly enough, Samsung and HTC also belong to the PMA.
Ideally, these wireless charging standards would be unified, meaning that in the future all mobile devices that support wireless charging could utilize standard charging mats. Users would no longer have to purchase separate charging stations for each device. Businesses could put out wireless charging mats for their customers and everyone would be able to use them. The standardization of wireless charging will likely take some time, but such a move could result in the technology becoming more appealing to consumers.