A few years ago, the idea of an online hard disk would have sounded ludicrous. But now, with high-speed connections such as DSL and cable finally reaching homes, online storage services are starting to make sense. Not only do online storage sites let you make files easily available to your coworkers and friends, they also put work at your fingertips from any Web-connected computer. It’s a brilliant idea for travelers, telecommuters, and anyone who works on office files at home. Now, scads of Web sites will store your data on their servers–most for free.