Update 26/07/2012: if you want a more recent review, you could check this article. It is from another blog about Stavanger restaurants.
Hall toll is a famous bar / night club in Stavanger but something that is less well known is that this place is also a pretty nice restaurant.
The restaurant is located on the harbour but a bit further towards the sea and less "central Stavanger". It is a really good spot in summer to see the sunset.
All in all, not a restaurant I would go to every day (a bit too formal and expensive for me) but a very good on-occasion-restaurant.