this is not quite possible because a developer would need access to the kernel level of a blackberry device- which java ME does not provide. Such communication is only possible if you work for the development team of the webcam maker. They are the only people with access to the hardware specs to associate devices. on top of that, USB by spec requires 5 volts of power, a blackberry by no means is a device worth providing said power requirments. it barley has enough juice to power itself. i have just skimmed the top of issues related to this awesome idea, however, it is just not possible. maybe one day we will see phone with open source operating systems that Dev's can take advantage of.