According to this press release, RIM has released the APIs needed to take photos with the Blackberry camera in Java apps.  As far as I have figured out, they have enabled the API to start the camera app, but not an API to listen for new photos.  That isn’t particularly horrible, because you can use the File Connection API to open the Blackberry filesystem and monitor for new photos.  The only tricky part is knowing when the camera app has relinquished control back to your app, so you can start looking for the new photos.