Unless the wireless charging capabilities were implemented by the various locations you frequent, you would still have to carry around a charger of some sorts. Whether it's a mat similar to the ones that mobile phones can use, or the normal plug and charge.
As far as the charging mats go, the Powermat offers a disc that you can set on the charging mat, which has a charging connector that plugs into the same place as your wired charger.
...there’s a special disc, called PC+,
which plugs into the notebook’s USB (not the USB, this was an error on the blogger's part; it seems to be the power port - same place you plug in your wired charger)
port. Set the disc down on the mat,
which, of course, is plugged into the
wall, and the notebook will start
charging. - Latptop Mag
The benefit of this being that you could just carry around the mat, instead of having to carry around a laptop charger and a mobile phone charger (also works for eReaders and portable gaming devices).