the old
pigsfly forum has some nice pieces in it (but is nearly dead) and the newer
steakunderwater forum too
the steakunderwater forum als hosts a copy of the "vfxpedia", the former eyeon fusion wiki. there are some examples and tipps "hidden"
there are a lot of places which offer some downloads or tutorials, tipps, tricks but you must strengthen your internet search muscle to find them
because of the rather small community around fusion there is not much to find (yet).