External Links

Cervesa Japonica is a blog by Stephen Lacey on Japanese craft beers, beer fests and homebrewing.
http://japan-beer.blogspot.com/

Beer Advocate
http://beeradvocate.com/

Brewium seems to be a new site "dedicated to the science of homebrewing"
http://www.brewium.com/

Homebrew Talk Wiki
http://www.homebrewtalk.com/wiki/index.php/Main_Page

Wikipeida articles:

Beer

Homebrewing

Homebrewinng Beer

Brewing

Wikibooks Brewing
http://en.wikibooks.org/wiki/Brewing

Google and "convert" Google is useful for converting to and from metric, for example pipe sizes:
convert 5/8 inch to mm
and for comparing prices in different countries, for example prices of dried malt extract:
convert 12 usd/3 lbs to yen/100 gram