The more online hours you've clocked, the more WebMD will do for you. No registration, except for chat and message boards, which require a nickname and password. The health arm of Oprah Winfrey's Oxygen network, this site is geared toward women. Fact sheets about HIV, transmission and drug therapy. Search for news and health info.
Message boards are fairly active and lively.
Interactive polls include great explanations of complex issues. Top website picks from our net-savvy staffers. It assumes knowledge of basic international issues and skips Geography 101. Perfect for choosing Expo sites and how best to tailor them to local communities. But it took me 20 minutes and five tries to open a file in Stuffit Deluxe.