I have been hard at work on the DNN module. Just when I thought I was nearly done, I discovered a fundamental incompatibility with DNN: DNN allows multiple portals within the same web application. Each portal is distinct from another, meaning GSP must support multiple galleries running in the same web app. However, GSP was structured so that gallery settings are in a single file galleryserverpro.config, so I am refactoring the app so that there can be multiple sets of settings - now in the database instead of a file. This is turning into a quite a bit of work, but it is proceeding orderly.
I am hoping to release it by the end of July, with a beta published (maybe) by the end of June. If you want to play with an earlier version that supports only a single portal, contact me and I can email it to you.
Roger Martin
Creator and Lead Developer of Gallery Server Pro