Thanks for the info.

Well, it seems the Windows Mobile is somewhat ahead of the other platforms.
Now it only needs that one manufacturer will make a smartphone with full USB host capabilty and write a few drivers for some regular USB peripherals (keyboards, mice etc). This will start an avalanche, enthusiast users will write drivers for all kind of other peripherals and this will push the peripherals manufacturers to make themselves the drivers for that device's operating system.

cheers