i made apple and rosehip jelly this year (pretty much exactly the same recipe as described above) and it's lovely. the rosehips give an interesting taste, completely different from any jams or jellies you would buy in the shops.
rosehip syrup is lovely over pancakes.

oh and also, in sweden they make a sort of rosehip "soup" which can either be eaten on it's own, diluted to a drink, or poured over icecream. i'm not sure how you'd go about making it, but it was good with icecream - surprisingly!