Medevil and iSpazio have got it live on Cydia. The app allows you to send anything from the file system i.e. Images aswell as other files.

 
“Trusst the rogue programmers and Cydia—the independent equivalent to the iTunes App Store to bring you one of the most awaited features ever for the iPhone: Bluetooth file transfer.” In the video below, you can see iBluetooth will bring you just that, allowing the iPhone to transfer files to any other device using Bluetooth. In this case, the application developed by MeDevil is working with an iMac and a Sony Ericsson handset but, once it is finished and available through Cydia, it will work with any device supporting the Bluetooth file transfer protocol.