Yahoo.com

We've already singled out a few of our favorites from Yahoo's basket of goodies — Flickr, Del.icio.us, Bix — but the site is also number two in Web search. A free account with Yahoo Mail now comes with unlimited storage, and fewer restrictions on file attachments. You can also access your messages on your cell phone. Another favorite site within the mega-site is Yahoo! Answers, a community where visitors post questions, users respond, and everybody rates and ranks those responses. The site boasts 21.4 million unique U.S. visitors a month and more than 130 million answers to millions of questions ranging from, 'How is yoga different from Pilates?' to, 'What do you do about The Annoying Guy at work?' Meanwhile, new social networking site wis.dm takes an entirely different approach to online Q&A.