There are three ways I can think of to do this, and if anyone's tried any of them, I'd love to hear about it. The first way is to simply save the images (photo files, JPEGs) to a directory in the filesystem (and maybe a scaled-down version to slighly decrease bandwidth use).
The second way is to store the files (original, scaled-down) in the database, and just get them each time when someone asks for e.g. /users/paulproteus/img1.jpg.
The third way is to store them off-site, and have the LJ code modified to accept the images, and then store the actual data somewhere else; then the IMG SRC HTML code would point to that off-site location. For example, LJ could FTP the images up somewhere.
Has anyone tried anything like this? (And would lj_dev have been a better place to ask?) Thanks!