Promash is the most comprehensive brewing tool currently available. Its interface is awful though and it shows that it was developed several years ago.
It looks complicated at first glance, but after using it for every batch for the past few months I have found it is invaluable. I would recommend it to anyone. I record everything from my batch. Its got a great calculator for mash & sparge water. If you want to throw in a protein rest you can accomodate it into your mash schedule. There is a little utility for diluting wort with water or other wort. Plus it lets me specify how much beer is to be bottled and kegged at a given temp and it will give me the sugar req. for priming and the psi on my regulator for my chosen level of carbonation.
There are settings to convert all the units to metric. I still use farenheit for temp though. :rolleyes:
Beer Tools as has already been mentioned is a great online tool especially for creating your own recipes. Give it your style and ingredients and it will formulate a recipe which you can then tweak. I've designed some great recipes using this. Beer Tools are working on Beer Tools Pro a standalone version with features to match promash. I am on the list of trial users at the beta stage. When I have played around with it I will let you know how it compares.
There are some excellent craft breweries in the US; Sierra Nevada, Victory, Red Hook, Rogue and Brooklyn to name but a few. The commercial beers are light in taste due to using highly fermentable adjuncts and many varieties of hops for consistency of flavour (or lack of

). The distinctive thing about american craft beers is the american hops, most notably cascade. They give their brews very hoppy fruity flavours and floral aromas which can be quite dominant. Admittedly they are not to everyones taste. Personally, I love them. The larger Sainsburys occasionally carry the odd Rogue brew, definitely worth a try. Their Youngers Bitter is magic. :beer