There are certain things you can consider milestones in a fandom. The creation of fan-films is one. Another is when fan-films reach a near-cinematic level of content, as with Return of the Ghostbusters. And then you start to have cross-overs.
The Ghostbusters of New Hampshire and Ghostbusters Salt Lake City have recently revealed that they are working on a cross-over film together! And you won’t have to wait long to see the finish film, entitled GBNH: Spilled Milk, as they are looking at finishing and releasing it before the Summer is out.
If you want to follow production and progress, you can check out their thread at GBFans. And just for giggles, they sent a handful of photos.