Open Photo Attachment works if you have a BES -- it would cost $10 to $25 additional per month. Additional advantages includes a bigger Inbox, more reliable Internet capability (TCP/IP), better web browsing than BWC, and wireless over-the-air synchronization.
Here is the Hosted BES/MDS FAQ: http://www.blackberryforums.com/viewtopic.php?t=53
I have a 7280 and Open Attachment works on JPG's. I am paying $23 per month for BES/MDS service.