Here are a handful of breweries and importers that offer online shopping pages in English.
The selection includes seven year-round beers: Wheat King Ale, Rising Sun Pale Ale, Red Rose Amber Ale, Teikoku IPA, Angry Boy Brown Ale, Kurofune Porter, and Shimaguni Stout
The full line of Ezo Beer and Rogue Ales, plus a few Scottish ales and Belgian beers
Orca mostly carries wines from Washington and Oregon, but they have a few selections from Redhook Brewery in Washington State.
Two organic Wolaver ales are available from this online and mail-order health-food shop
Just one beer (but it's a good one): Tokyo Ale No. 3
This site lists thousands of beer offers (cases, gift sets, and individual bottles). You can browse by clicking on the beer categories. Searches are also possible but must be typed in katakana -- which can be a problem with Belgian and German names. On the Rakuten site, you need to register once with your credit card information; thereafter, you simply need to log in and do not need to re-enter information.
Similar to Rakuten Ichiba, the Yahoo! Japan Shopping site offers a smaller selection of beers. Searches may be typed in and sorted according to price.
A wide selection of beers from Belgium and other countries (Japan, Germany, USA, Ireland, England, and Australia)
Many Belgian and German beers
A good range of Belgian, German, and U.S. brews
Wide variety of Belgian styles & others (German, UK, Irish, Dutch, Canadian, US, and various Asian beers)
Belgian beers
A variety of Japanese, Belgian, German, and U.S. beers
Bargain hunting. Good luck!
Stocks many hard-to-find beers from several countries
Online retailer specializing in Japanese microbrews
A good selection of Japanese and world brews
A very limited number of Japanese breweries' offerings.
Six Japanese microbrews delivered to your door each month for 3,000 yen.
Many Japanese craft breweries have their own retail web sites. Some work through Rakuten or Livedoor. Below are links to online shopping sites for 1) twenty-one great Japanese microbreweries and 2) dozens of other Japanese microbreweries. (Note: All sites, except Baird Beer, are in Japanese.)
Here are links to more than ninety other Japanese microbreweries. Can't find your favorite? Try a search on Google, RateBeer.com, or beeradvocate.com.