FastCounter by LinkExchange
The Brewery: Total Homebrewing Info. This site belongs in every homebrewer's bookmarks.
Jean-Sebastien and Melanie's: Homebrewery Designs and Technical References has links to many popular RIMS pages and more.
My local supplier of homebrew supplies. Ed has tons of knowledge on making fermentables and is certainly one of the best stocked shops in Central New York. Check out his site.