Would be nice to be able to add Isomerised hop extract to the ingredients, with appropriate calculator for AA/IBU. For example, http://www.brouwland.com/setframes/...atproducts.asp?cfid=4&id=341&pid=338&shwlnk=0 states it has 6% AA, and according to this post: http://www.nationalhomebrewclub.com/forum/index.php/topic,2569.msg30977.html#msg30977 "From Dirk in Brouland's Technical Department, regarding Isomerised Hop Extract, iso alha acidity 6%: "1ml of this extract into 10 liter increases the IBU with 4." Be nice to allow for different strengths of such extract. I use it to adjust bitterness, sometimes if I don't have enough bittering hops on hand, or if I'm doing a quick extract brew with short boil time. Fantastic software by the way!