For the most part, there are now two major wireless charging standards.
Qi, which is on many devices.
and
PMA, which looks like its focusing on putting it in venues and businesses.
Just make sure you are using the phone with a Qi compatible charger, as using it with a non-Qi one will not work, including, but not limited to, PMA chargers, Palm Touchstones...
But Qi compatible chargers are out there, from cheap chinese ones, to Nokia's DT-900, to Google's charging orb, to one by LG.
also be careful with cheap ones, they could be flaky.
Also remember just in case, that the 925 does not have Qi built in. It requires the use of an external shell unlike the 928 and 920.