Some of the sites that I visit on a regular basis:
Beer Calculus – Homebrew recipe calculator
Beer.edu – Learn all about home brewing at RealBeer.com
Brewer’s Choice – My local home brew shop/club
Brewiki – Resource for Aussie home brewers (mainly)
BrewToolz – Online brewing and logging tool
GTWF – My favourite beer podcast (they make me laugh!)
HopfenTreader – Homebrewer, Probrewer, and Craft Beer Evangelist
Hopville – Home to recipes and home brewers
How to homebrew – The definitive book on making quality beers at home
Beer Recipator – A beer recipe calculator online
Beer Bureau – Aussie craft beer news