Motorola miniUSB chargers, in conjunction with a miniUSB to microUSB adapter, will charge the Treo Pro.
The issue is to do with the input amperage of the charger. The output specs of Palm's charger are the same as any other charger I've seen, but the input amperage is 0.3A whereas the typical input amperage is 0.15A. Motorola chargers tend to be 0.2A input, which is enough for the Treo Pro, or at least the GSM version of it.
I know it doesn't make any sense, but if it's stupid but it works, it isn't stupid.
