Shoot me an email (ben at wcvendors dot com). I wrote a plugin a few months ago to import pictures to rtMedia. It successfully imported over 200,000 pictures. It will not work for you out of the box because the database your importing from is surely different than the database I was importing from, however it’ll give you a great head start if your up for it. No charge, you can have the plugin for free, as long as you dont expect me to get it to work for you or provide any support on it at all.
I dont work for rtCamp, I’m just a happy customer of their products.